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poly I:C
poly I:C [päl′ē ī′sē′] n. 〚polyi( nosinic-poly) c( ytidylic acid)〛 a synthetic RNA that promotes the production of interferon in the body * * * pol·y I:C ...
poly sci
Informal. See poli sci. * * *
poly-
a combining form with the meanings "much, many" and, in chemistry, "polymeric," used in the formation of compound words: polyandrous; polyculture; polyethylene. [ < Gk, comb. ...
poly.
polytechnic. * * *
polyacid
/pol'ee as"id/, Chem. adj. 1. having more than one replaceable hydrogen atom. 2. capable of reacting with more than one equivalent weight of an acid. n. 3. an acid having more ...
polyacrylamide
/pol'ee euh kril"euh muyd', -mid, -ak'reuh lam"uyd, -id/, n. Chem. a white, solid, water-soluble polymer of acrylamide, used in secondary oil recovery, as a thickening agent, a ...
polyacrylamidegel
polyacrylamide gel n. A hydrated polyacrylamide of stiff consistency used as a medium for electrophoresis because of its white coloring and thickening action in water-based ...
polyacrylic acid
/pol"ee euh kril"ik, pol'-/, Chem. a polymer of acrylic acid used as a sizing agent in the manufacture of nylon and other synthetic textiles. [1925-30; POLY- + ACRYLIC] * * *
polyacrylonitrile
/pol'ee ak'reuh loh nuy"tril, -treel, -truyl/, n. Chem. a polymer of acrylonitrile used in the manufacture of Orlon and other synthetic textiles. [1930-35; POLY- + ...
polyadelphous
/pol'ee euh del"feuhs/, adj. Bot. (of stamens) united by the filaments into three or more sets or bundles. [1855-60; < Gk polyádelphos having many siblings; see POLY-, ...
polyadenylic acid
/pol"ee ad'n il"ik, pol'-/, Biochem. a homopolymer of adenylic acid enzymatically added to messenger RNA in eukaryotic cells to inhibit the hydrolytic breakdown of messenger ...
polyadenylicacid
pol·y·ad·e·nyl·ic acid (pŏl'ē-ăd'n-ĭlʹĭk) n. A polymer of adenylic acid that is sometimes attached to eukaryotic messenger RNA and stabilizes the molecule before ...
Polyaenus
▪ Macedonian rhetorician flourished 2nd century AD       Macedonian rhetorician and pleader who lived in Rome and was the author of a work entitled Strategica (or ...
Polyakov, Valery Vladimirovich
▪ Soviet cosmonaut born April 27, 1942, Tula, Russia, U.S.S.R.    Russian cosmonaut who holds the record for the longest single spaceflight in history.       Polyakov ...
polyalcohol
/pol'ee al"keuh hawl', -hol'/, n. Chem. polyol. [1895-1900; POLY- + ALCOHOL] * * *
polyalphabetic substitution
/pol"ee al'feuh bet"ik, pol'ee-/, Cryptography. a system of substitution that mixes together a number of cipher alphabets in a cryptogram so that each plaintext letter is ...
polyamide
/pol'ee am"uyd, -id/, n. Chem. a polymer in which the monomer units are linked together by the amide group -CONH-. [1925-30; POLY- + AMIDE] * * *
polyamine
/pol'ee euh meen", -am"in/, n. Chem. a compound containing more than one amino group. [1860-65; POLY- + -AMINE] * * *
polyandric
/pol'ee an"drik/, adj. polyandrous. [1865-70; POLYANDR(Y) + -IC] * * *
polyandrist
/pol'ee an"drist, pol"ee an'-/, n. a woman who practices or favors polyandry. [1825-35; POLYANDR(Y) + -IST] * * *
polyandrous
/pol'ee an"dreuhs/, adj. 1. of, pertaining to, characterized by, or practicing polyandry; polyandric. 2. Bot. having an indefinite number of stamens. [1820-30; < Gk polyándros ...
polyandry
/pol"ee an'dree, pol'ee an"-/, n. 1. the practice or condition of having more than one husband at one time. Cf. monandry (def. 1). 2. (among female animals) the habit or system ...
polyangular
/pol'ee ang"gyeuh leuhr/, adj. multangular; multiangular. [1680-90; POLY- + ANGULAR] * * *
polyantha
polyantha [päl΄ē an′thə] n. 〚ModL < Gr polyanthos: see POLYANTHUS〛 a strain of cultivated roses (Rosa polyantha) having numerous small flowers borne in a cluster * * *
polyanthus
/pol'ee an"theuhs/, n., pl. polyanthuses. 1. a hybrid primrose, Primula polyantha. 2. a narcissus, Narcissus tazetta, having small white or yellow flowers. [1620-30; < NL < Gk ...
polyanthusnarcissus
polyanthus narcissus n. A bulbous Mediterranean plant (Narcissus tazetta) having clusters of fragrant flowers with white perianths and yellow coronas. * * *
polyaramid
pol·y·ar·a·mid (pŏl'ē-ărʹə-mĭd) n. See aramid fiber. * * *
polyarchy
—polyarchic, polyarchical, adj. /pol"ee ahr'kee/, n., pl. polyarchies. a form of government in which power is vested in three or more persons. [1600-10; POLY- + -ARCHY] * * *
polyarteritis
/pol'ee ahr'teuh ruy"tis/, n. Pathol. inflammation of the layers of an artery or of many arteries, usually caused by a severe hypersensitivity reaction, and characterized by ...
polyarteritis nodosa
▪ pathology also called  periarteritis nodosa        inflammation of blood vessels (blood vessel) and surrounding tissue; it may affect functioning of adjacent ...
polyarthritis
/pol'ee ahr thruy"tis/, n. Pathol. arthritis occurring in more than one joint. [1895-1900; POLY- + ARTHRITIS] * * *
polyarticular
/pol'ee ahr tik"yeuh leuhr/, adj. Anat. pertaining to or affecting many joints. [1870-75; POLY- + ARTICULAR] * * *
polyatomic
/pol'ee euh tom"ik/, adj. Chem. pertaining to a molecule containing more than two atoms. [1855-60; POLY- + ATOMIC] * * *
polybasic
—polybasicity /pol'ee bay sis"i tee/, n. /pol'ee bay"sik/, adj. Chem. (of an acid) having two or more atoms of replaceable hydrogen. [1835-45; POLY- + BASIC] * * *
polybasite
/pol'ee bay"suyt, peuh lib"euh suyt'/, n. a blackish mineral, Ag9SbS6: a minor ore of silver. [1820-30; < G Polybasit. See POLY-, BASE1, -ITE1] * * * ▪ ...
Polybius
/peuh lib"ee euhs/, n. c205-c123 B.C., Greek historian. * * * born с 200, Megalopolis, Arcadia, Greece died с 118 BC Greek statesman and historian. Son of an Achaean ...
polybrominated biphenyl
/pol'ee broh"meuh nay'tid/, Chem. See PBB. [1970-75; POLY- + BROMINATED] * * *
Polybus
/pol"euh beuhs/, n. Class. Myth. a Corinthian king who was the foster father of Oedipus. * * *
polybutadiene
/pol'ee byooh'teuh duy"een, -duy een"/, n. Chem. a rubberlike polymer of butadiene blended with other synthetics to replace natural rubber in tires. [1930-35; POLY- + ...
polybutylene
/pol'ee byooht"l een'/, n. Chem. any of several polymers of butylene, used chiefly in the manufacture of lubricants and synthetic rubber. Also, polybutene /pol'ee ...
polycarbonate
/pol'ee kahr"beuh nayt', -nit/, n. Chem. a synthetic thermoplastic resin, a linear polymer of carbonic acid, used for molded products, films, and nonbreakable windows. Cf. ...
Polycarp
/pol"ee kahrp'/, n. Saint, A.D. 69?-155, bishop of Smyrna and a Christian martyr. * * *
Polycarp, Saint
▪ Greek bishop flourished 2nd century, ; feast day February 23       Greek bishop of Smyrna who was the leading 2nd-century Christian figure in Roman Asia by virtue of ...
Polycarp,Saint
Pol·y·carp (pŏlʹē-kärp'), Saint. A.D. 69?-155?. Christian martyr. A student of the Apostle John, he was burned at the stake during a period of persecution of Christians in ...
polycarpellary
/pol'ee kahr"peuh ler'ee/, adj. Bot. consisting of two or more carpels. [1855-60; POLY- + CARPELLARY] * * *
polycarpic
—polycarpy, n. /pol'ee kahr"pik/, adj. Bot. 1. producing fruit many times, as a perennial plant. 2. having a gynoecium composed of two or more distinct ovaries. Also, ...
polycarpous
pol·y·car·pous (pŏl'ē-kärʹpəs) also po·ly·car·pic (-pĭk) adj. Having fruit or pistils with two or more carpels.   polʹy·car'py n. * * *
polycarpy
See polycarpous. * * *
polycentric
/pol'ee sen"trik/, adj. having many centers, esp. of power or importance: the polycentric world of banking. [1885-90; POLY- + -CENTRIC] * * *
polycentrism
—polycentric, adj. —polycentrist, n., adj. /pol'ee sen"triz euhm/, n. 1. the doctrine that a plurality of independent centers of leadership, power, or ideology may exist ...
polychaete
/pol"i keet'/, n. 1. any annelid of the class Polychaeta, having unsegmented swimming appendages with many setae or bristles. adj. 2. Also, polychaetous. belonging or pertaining ...
polychaete hypothesis
▪ paleontology       theory that conodonts (minute toothlike structures found as fossils in marine rocks) are parts of the jaw apparatus of polychaete worms, a class of ...
polychasium
—polychasial, adj. /pol'ee kay"zhee euhm, -zheuhm, -zee euhm/, n., pl. polychasia /-zhee euh, -zheuh, -zee euh/. Bot. a form of cymose inflorescence in which each axis produces ...
polychete
pol·y·chete also pol·y·chaete (pŏlʹĭ-kēt') n. Any of various annelid worms of the class Polychaeta, including mostly marine worms such as the lugworm, and characterized ...
polychetous
See polychete. * * *
polychlorinated biphenyl
/pol'ee klawr"euh nay'tid, -klohr"-/, Chem. See PCB. [1960-65; POLY- + CHLORINATED] * * * ▪ chemical compound       any of a class of organohalogen compounds prepared ...
polychlorinatedbiphenyl
pol·y·chlo·rin·at·ed biphenyl (pŏl'ē-klôrʹə-nā'tĭd, -klōrʹ-) n. PCB. * * *
polychlorotrifluoroethylene
▪ chemical compound       synthetic resin belonging to the family of organic polymers, prepared by treatment of an aqueous suspension of chlorotrifluoroethylene with a ...
polychondritis
▪ pathology       chronic disease characterized by inflammation and destruction of the cartilage of various tissues of the body. The cause of polychondritis is unknown, ...
polychotomy
polychotomy [päl΄i kät′ə mē] n. pl. polychotomies 〚 POLY- + -chotomy, infl. by DICHOTOMY〛 division or separation into many parts, classes, etc. polychotomous [päl΄i ...
polychromatic
—polychromatism /pol'ee kroh"meuh tiz'euhm/, n. /pol'ee kroh mat"ik, -kreuh-/, adj. having or exhibiting a variety of colors. Also, polychromic /pol'ee kroh"mik/. [1840-50; ...
polychromatophile
See polychromatophilic. * * *
polychromatophilia
pol·y·chro·mat·o·phil·i·a (pŏl'ē-krō-măt'ə-fĭlʹē-ə) also pol·y·chro·mo·phil·i·a (-krō'mə-fĭlʹē-ə) n. Affinity for more than one type of stain, ...
polychromatophilic
/pol'ee kroh'meuh teuh fil"ik/, adj. Cell Biol. having an affinity for more than one kind of stain, esp. for acid, neutral, and basic stains, as polychromatophilic erythroblasts ...
polychrome
/pol"ee krohm'/, adj., v., polychromed, polychroming, n. adj. 1. being of many or various colors. 2. decorated or executed in many colors, as a statue, vase, or mural. v.t. 3. to ...
polychromic
pol·y·chro·mic (pŏl'ē-krōʹmĭk) or pol·y·chro·mous (-məs) adj. Variants of polychromatic. * * *
polychromy
—polychromous, adj. /pol"ee kroh'mee/, n. the art of employing many colors in decoration, as in painting or architecture. [1855-60; POLYCHROME + -Y3] * * *
polycistronic
/pol'ee si stron"ik/, adj. Genetics. of or pertaining to the transcription of two or more adjacent cistrons into a single messenger RNA molecule. [1960-65; POLY- + CISTRON + ...
polyclad
/pol"ee klad'/, n. any free-swimming, marine flatworm of the order Polycladida, having a broad, flat body and a many-branched gastrovascular cavity. [1885-90; < NL Polycladus ...
Polycleitus
Pol·y·clei·tus (pŏl'ĭ-klīʹtəs) See Polyclitus. * * *
polyclinic
/pol'ee klin"ik/, n. a clinic or a hospital dealing with various diseases. [1885-90; alter. of POLICLINIC by assoc. with POLY-] * * *
Polyclitus
/pol'i kluy"teuhs/, n. fl. c450-c420 B.C., Greek sculptor. Also, Polycleitus, Polycletus /pol'i klee"teuhs/. * * * or Polycleitus or Polykleitos flourished 5th century BC, ...
polyclonal
/pol'ee klohn"l/, adj. 1. Biol. pertaining to cells or cell products derived from several lines of clones. n. 2. Immunol. See polyclonal antibody. [1960-65; POLY- + CLONAL] * * *
polyclonal antibody
a mixture of antibodies of different specificities, as in the serum of a person immunized to various antigens. Also called polyclonal. * * *
polyclonally
See polyclonal. * * *
polycondensation
/pol'ee kon'den say"sheuhn/, n. Chem. formation of a polymer by chemical condensation with the elimination of a small molecule, such as water. [1935-40; POLY- + CONDENSATION] * * ...
polyconic
/pol'ee kon"ik/, adj. pertaining to or utilizing two or more cones. [1860-65; POLY- + CONIC] * * *
polyconic projection
Cartog. a conic projection in which the parallels are arcs of circles that are not concentric but are equally spaced along the central straight meridian, all other meridians ...
polyconicprojection
pol·y·con·ic projection (pŏl'ē-kŏnʹĭk) Clarinda/Academy Artworks n. A conic map projection having distances between meridians along every parallel equal to those ...
polycot
/pol"ee kot'/, n. Bot. a polycotyledon. [by shortening] * * *
polycotyledon
—polycotyledonous, adj. /pol'ee kot'l eed"n/, n. a plant having more than two cotyledons, as certain gymnosperms. [1750-60; POLY- + COTYLEDON] * * *
polycotyledonous
See polycotyledon. * * *
Polycrates
/peuh lik"reuh teez'/, n. died 522? B.C., Greek tyrant of Samos. * * * flourished 6th century BC Tyrant of the Aegean island of Samos с 535–522 BC. He seized sole control ...
polycrystal
▪ crystallography       any solid object composed of randomly oriented crystalline regions, called crystallites (crystallite), especially as distinguished from a single ...
polycrystalline
/pol'ee kris"tl in, -uyn', -een'/, adj. 1. (of a rock or metal) composed of aggregates of individual crystals. 2. having or consisting of crystals that are variously ...
polyculture
/pol"ee kul'cheuhr/, n. 1. the raising at the same time and place of more than one species of plant or animal. 2. a place where this is done. [1910-15; POLY- + CULTURE] * * *
polycyclic
/pol'ee suy"klik, -sik"lik/, adj. Chem. pertaining to an organic compound containing several atomic rings, usually fused. [1865-70; POLY- + CYCLIC] * * *
polycystic
polycystic [päl΄i sis′tik] adj. made up of or containing many cysts [a polycystic kidney] * * * pol·y·cys·tic (pŏl'ē-sĭsʹtĭk) adj. Having or containing many ...
polycystic ovary syndrome
or Stein-Leventhal syndrome Endocrine disorder in women, characterized by high androgen levels and infrequent or absent ovulation (see reproductive system). It causes a high ...
polycythemia
polycythemia [päl΄i sī thē′mē ə] n. 〚 POLY- + CYT(O)- + -HEMIA〛 an abnormal increase in the number and concentration of circulating red blood corpuscles * * ...
polydactyl
/pol'ee dak"til/, adj. Also, polydactylous. 1. having many or several digits. 2. having more than the normal number of fingers or toes. n. 3. a polydactyl animal. [1860-65; < Gk ...
polydactylism
See polydactyl. * * *
polydactyly
/pol'ee dak"teuh lee/, n. Pathol. the condition of being polydactyl. Also, polydactylism. [1885-90; POLYDACTYL + -Y3] * * *
polydaemonism
—polydaemonist, n., adj. —polydaemonistic, adj. /pol'ee dee"meuh niz'euhm/, n. the belief in many evil spirits. Also, polydemonism. [1705-15; POLY- + DAEMON + -ISM] * * *
polydemic
pol·y·dem·ic (pŏl'ē-dĕmʹĭk) adj. Occurring in or inhabiting two or more regions: polydemic species.   [poly- + endemic.] * * *
Polydeuces
/pol'i dooh"seez, -dyooh"-/, n. Greek name of Pollux. * * *
polydipsia
/pol'ee dip"see euh/, n. Med. excessive thirst. [1650-60; < NL < Gk polydíps(ios) very thirsty (poly- POLY- + díps(a) thirst + -ios adj. suffix) + -ia -IA] * * *
polydipsic
See polydipsia. * * *
polydisperse
/pol'ee di sperrs"/, adj. Physical Chem. of or noting a sol that contains particles of different sizes. [1910-15; POLY- + DISPERSE] * * *
polydomous
/peuh lid"euh meuhs/, adj. living in more than one nest, as certain ant colonies. Cf. monodomous. [POLY- + Gk dóm(os) house + -OUS] * * *
polydontia
/pol'ee don"sheuh, -shee euh/, n. Dentistry. the condition of having more than the normal number of teeth. [POLY- + -(O)DONT + -IA] * * *
Polydorus
/pol'i dawr"euhs, -dohr"-/, n. fl. 1st century B.C., Greek sculptor who, with Agesander and Athenodorus, carved the Laocoön group. * * *
polydrug
/pol'ee drug"/, adj. being or pertaining to several drugs used simultaneously, esp. narcotics or addictive drugs: a center for dealing with polydrug abuse. [1970-75; POLY- + ...
polyelectrolyte
/pol'ee i lek"treuh luyt'/, n. Chem. an electrolyte of high molecular weight, usually polymeric, either natural or synthetic. [1945-50; POLY- + ELECTROLYTE] * * *
polyembryonic
See polyembryony. * * *
polyembryony
/pol'ee em"bree euh nee, -oh'nee, -em bruy"euh nee/, n. Embryol. the production of more than one embryo from one egg. [1840-50; POLY- + Gk émbryon EMBRYO + -Y3] * * * ▪ ...
polyene
/pol"ee een'/, n. Chem. a hydrocarbon containing two or more double bonds, often conjugated. [1925-30; POLY- + -ENE] * * *
polyester
—polyesterification /pol'ee es'teuhr euh fi kay"sheuhn/, n. /pol"ee es'teuhr, pol'ee es"teuhr/, n. 1. Chem. a polymer in which the monomer units are linked together by the ...
polyesterification
See polyester. * * *
polyestrous
/pol'ee es"treuhs/, adj. having several estrus cycles annually or during a breeding season. Also, polyoestrous. [1895-1900; POLY- + ESTROUS] * * *
polyether
/pol'ee ee"theuhr/ n. Chem. a polymeric ether. [1920-25; POLY- + ETHER] * * * ▪ chemical compound       any of a class of organic substances prepared by joining ...
polyethnic
/pol'ee eth"nik/, adj. inhabited by or consisting of people of many ethnic backgrounds. [1885-90; POLY- + ETHNIC] * * *
polyethylene
/pol'ee eth"euh leen'/, n. Chem. a plastic polymer of ethylene used chiefly for containers, electrical insulation, and packaging. Also called, Brit., polythene. [1935-40; POLY- + ...
polyethylene (PE)
Any of the polymers of ethylene, the largest class of plastics. Its simple basic structure, of ethylene monomers, can be linear (high-density and ultrahigh-molecular-weight ...
polyethylene glycol
Chem. any of a series of polymers of ethylene glycol, having a molecular weight of from about 200 to 6000, obtained by condensation of ethylene glycol or of ethylene oxide and ...
polyethyleneglycol
polyethylene glycol n. Any of a family of colorless liquids with high molecular weight that are soluble in water and in many organic solvents and are used in detergents and as ...
polyfoam
/pol"ee fohm'/, n. a rigid, semirigid, or rubbery foam composed of minute bubbles of air or carbon dioxide embedded in a polymer matrix, often polyurethane: used in mattresses, ...
polyfunctional
/pol'ee fungk"sheuh nl/, adj. Chem. containing more than one functional group. [1925-30; POLY- + FUNCTIONAL] * * *
polygala
—polygalaceous /pol'ee geuh lay"sheuhs, peuh lig'euh-/, adj. /peuh lig"euh leuh/, n. any plant of the genus Polygala, comprising the milkworts. [1570-80; < NL, genus name, ...
polygamic
/pol'ee gam"ik/, adj. polygamous. [1810-20; POLYGAM(Y) + -IC] * * *
polygamist
—polygamistic, adj. /peuh lig"euh mist/, n. a person who practices or favors polygamy. [1630-40; POLYGAM(Y) + -IST] * * *
polygamophile
/pol'ee gam"euh fuyl'/, n. a person who approves of or countenances polygamy, esp. as practiced by others. [1705-15; POLYGAM(Y) + -O- + -PHILE] * * *
polygamous
—polygamously, adv. /peuh lig"euh meuhs/, adj. 1. of, pertaining to, characterized by, or practicing polygamy; polygamic. 2. Bot. bearing both unisexual and hermaphrodite ...
polygamously
See polygamous. * * *
polygamy
/peuh lig"euh mee/, n. 1. the practice or condition of having more than one spouse, esp. wife, at one time. Cf. bigamy (def. 1), monogamy (def. 1). 2. Zool. the habit or system ...
polygene
—polygenic /pol'ee jen"ik/, adj. /pol"ee jeen'/, n. one of a group of nonallelic genes that together control a quantitative characteristic in an organism. [1940-45; back ...
polygenes
polygenes [päl′ə jēnz΄] pl.n. 〚
polygenesis
/pol'ee jen"euh sis/, n. Biol., Anthropol. origin from more than one ancestral species or line. [1860-65; POLY- + -GENESIS] * * *
polygenesist
See polygenesis. * * *
polygenetic
—polygenetically, adv. /pol'ee jeuh net"ik/, adj. 1. Biol. relating to or exhibiting polygenesis. 2. having many or several different sources of origin. [1860-65; POLY- + ...
polygenic
pol·y·gen·ic (pŏl'ē-jĕnʹĭk) adj. Of, relating to, or determined by polygenes: polygenic inheritance.   pol'y·genʹi·cal·ly adv. * * *
polygenic inheritance
Genetics. the heredity of complex characters that are determined by a large number of genes, each one usually having a relatively small effect. Cf. quantitative ...
polygenically
See polygenic. * * *
polygenism
—polygenist, n., adj. —polygenistic, adj. /peuh lij"euh niz'euhm/, n. the theory that the human race has descended from two or more ancestral types. [1875-80; POLY- + -GEN(Y) ...
polyglot
—polyglotism, n. /pol"ee glot'/, adj. 1. able to speak or write several languages; multilingual. 2. containing, composed of, or written in several languages: a polyglot ...
polyglot Bible
      any of several editions of the Bible in which the text consists of translations in various languages arranged in parallel columns. This arrangement allows scholars ...
polyglotism
See polyglot. * * *
polyglottism
See polyglotism. * * *
polygnathiform
▪ paleontology       conodont, or small toothlike fossil of uncertain relationship found widely in ancient marine rocks, that resembles or may be derived from the genus ...
Polygnotus
/pol'ig noh"teuhs/, n. fl. c450 B.C., Greek painter. * * * or Polygnotos born с 500, Thasos, Thrace died с 440 BC, Athens, Greece Greek painter. None of his works are ...
polygon
—polygonal /peuh lig"euh nl/, adj. —polygonally, adv. /pol"ee gon'/, n. a figure, esp. a closed plane figure, having three or more, usually straight, sides. See illus. under ...
polygonaceous
/pol'ee geuh nay"sheuhs, peuh lig'euh nay"-/, adj. belonging to the Polygonaceae, the buckwheat family of plants. Cf. buckwheat family. [1870-75; < NL Polygonace(ae) (Polygon(um) ...
polygonal
See polygon. * * *
polygonally
See polygonal. * * *
polygonum
polygonum [pō lig′ə nəm, pəlig′ə nəm] n. 〚ModL < L polygonon < Gr, kind of plant, knotgrass < poly-, many (see POLY-) + gony, a joint, KNEE: from the many ...
polygraph
—polygraphic /pol'i graf"ik/, adj. —polygraphist /peuh lig"reuh fist/, polygrapher, n. /pol"i graf', -grahf'/, n. 1. an instrument for receiving and recording simultaneously ...
polygrapher
See polygraph. * * *
polygraphic
See polygrapher. * * *
polygraphist
See polygrapher. * * *
polygynist
/peuh lij"euh nist/, n. a person who practices or favors polygyny. [1875-80; POLYGYN(Y) + -IST] * * *
polygynous
/peuh lij"euh neuhs/, adj. 1. of, pertaining to, characterized by, or practicing polygyny. 2. Bot. having many pistils or styles. [1840-50; POLYGYN(Y) + -OUS] * * *
polygyny
/peuh lij"euh nee/, n. 1. the practice or condition of having more than one wife at one time. 2. (among male animals) the habit or system of having two or more mates, either ...
polyhalite
▪ mineral       a sulfate mineral in evaporite deposits [K2Ca2Mg(SO4)4·2H2O] that often occurs with anhydrite and halite. Its name, from the Greek words meaning “many ...
polyhedral
/pol'ee hee"dreuhl/, adj. of, pertaining to, or having the shape of a polyhedron. [1805-15; < Gk polýedr(os) many-based (see POLYHEDRON) + -AL1] * * *
polyhedral angle
Geom. a configuration consisting of the lateral faces of a polyhedron around one of its vertices. The portion of a pyramid including one of its points is such a configuration. ...
polyhedralangle
polyhedral angle Lateralfaces VAB, VBC, VCD, VDE,and VEFjoin at the common vertex V to form a polyhedral angle. Clarinda/Academy Artworks n. A shape formed by three or more ...
polyhedron
/pol'ee hee"dreuhn/, n., pl. polyhedrons, polyhedra /-dreuh/. a solid figure having many faces. See illus. under dodecahedron, icosahedron, octahedron, pentahedron, ...
polyhedrosis
pol·y·he·dro·sis (pŏl'ē-hē-drōʹsĭs) n. pl. pol·y·he·dro·ses (-sēz) Any of several diseases of insect larvae, caused by infestation with polyhedral virus ...
polyhistor
—polyhistoric /pol'ee hi stawr"ik, -stor"-/, adj. —polyhistory, n. /pol'ee his"teuhr/, n. a person of great and varied learning. Also, polyhistorian /pol'ee hi stawr"ee euhn, ...
polyhistoric
See polyhistor. * * *
polyhydric
/pol'ee huy"drik/, adj. Chem. (esp. of alcohols and phenols) polyhydroxy. [1875-80; POLY- + HYDRIC1] * * *
polyhydroxy
/pol'ee huy drok"see/, adj. Chem. containing two or more hydroxyl groups. [1890-95; POLY- + HYDROXY] * * *
Polyhymnia
/pol'i him"nee euh/, n. Class. Myth. the Muse of sacred music and dance. [ < L, alter. of Gk Polýmnia. See POLY-, HYMN, -IA] * * *
polyimide
/pol'ee im"uyd, -id/, n. any of a class of polymers with an imido group: resistant to high temperatures, wear, radiation, and many chemicals. [1940-45; POLY- + -IMIDE] * * *
polyisobutylene
/pol'ee uy'seuh byooht"l een'/, n. Chem. a polymer of isobutylene, used chiefly in the manufacture of synthetic rubber. Also, polyisobutene /pol'ee uy'seuh byooh"teen/. [1930-35; ...
polyisoprene
/pol'ee uy"seuh preen'/, n. Chem. a thermoplastic polymer, (C5H8)n, the major constituent of natural rubber and also obtained synthetically. [1930-35; POLY- + ISOPRENE] * * *
polylingual
pol·y·lin·gual (pŏl'ē-lĭngʹgwəl) adj. 1. Of, including, or expressed in several languages; multilingual: a polylingual software program. 2. Using or able to use several ...
polymath
—polymathic, adj. /pol"ee math'/, n. a person of great learning in several fields of study; polyhistor. [1615-25; < Gk polymathés learned, having learned much, equiv. to poly- ...
polymathic
See polymath. * * *
polymathy
/peuh lim"euh thee/, n. learning in many fields; encyclopedic knowledge. [1635-45; < Gk polymathía; see POLYMATH, -Y3] * * *
polymer
/pol"euh meuhr/, n. Chem. 1. a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller ...
polymer, inorganic
Introduction  any of a class of large molecules that lack carbon and are polymers—that is, made up of many small repeating units called monomers (monomer). The word polymer ...
polymerase
/pol"euh meuh rays', -rayz'/, n. Biochem. any of several enzymes that catalyze the formation of a long-chain molecule by linking smaller molecular units, as nucleotides with ...
polymerase chain reaction
polymerase chain reaction n. a technique in which a known DNA sequence is synthesized at high temperatures by means of a polymerase, producing millions of copies for statistical ...
polymerase chain reaction (PCR)
Laboratory technique used to make numerous copies of specific DNA segments quickly and accurately. These are needed for various experiments and procedures in molecular biology, ...
polymerasechain reaction
polymerase chain reaction n. Abbr. PCR A technique for amplifying DNA sequences in vitro by separating the DNA into two strands and incubating it with oligonucleotide primers and ...
polymeric
/pol'euh mer"ik/, adj. Chem. 1. of or relating to a polymer. 2. (of compounds) having the same elements combined in the same proportion but different molecular weights. [1840-50; ...
polymerically
See polymeric. * * *
polymerism
/peuh lim"euh riz'euhm, pol"euh meuh-/, n. 1. Chem. a polymeric state. 2. Biol., Bot. a polymerous state. [1825-35; POLYMER + -ISM] * * *
polymerization
/peuh lim'euhr euh zay"sheuhn, pol'euh meuhr-/, n. Chem. 1. the act or process of forming a polymer or polymeric compound. 2. the combination of many like or unlike molecules to ...
polymerize
/peuh lim"euh ruyz', pol"euh meuh-/, v., polymerized, polymerizing. Chem. v.t. 1. to subject to polymerization. v.i. 2. to undergo polymerization. Also, esp. Brit., ...
polymerous
/peuh lim"euhr euhs/, adj. 1. Biol. composed of many parts. 2. Bot. having numerous members in each whorl. [1855-60; POLYMER + -OUS] * * *
polymethyl methacrylate
/pol'ee meth"euhl/, Chem. polymerized methyl methacrylate. [1930-35; POLY- + METHYL] * * *
Polymnia
Po·lym·ni·a (pə-lĭmʹnē-ə) n. Greek Mythology Variant of Polyhymnia. * * * ▪ Greek Muse also called  Polymnis , or  Polyhymnia        in Greek religion, ...
polymorph
—polymorphic, adj. /pol"ee mawrf'/, n. 1. Biol. an organism having more than one adult form, as the different castes in social ants. 2. Crystall. any of the crystal forms ...
polymorphic
See polymorphism. * * *
polymorphism
—polymorphistic, adj. /pol'ee mawr"fiz euhm/, n. 1. the state or condition of being polymorphous. 2. Crystall. crystallization into two or more chemically identical but ...
polymorphonuclear
/pol'ee mawr'feuh nooh"klee euhr, -nyooh"-/ or, by metathesis, /-kyeuh leuhr/, adj. Cell Biol. (of a leukocyte) having a lobulate nucleus. [1895-1900; POLY- + MORPHO- + ...
polymorphous
/pol'ee mawr"feuhs/, adj. 1. having, assuming, or passing through many or various forms, stages, or the like. 2. polymorphic. [1775-85; < Gk polýmorphos multiform. See POLY-, ...
polymorphously
See polymorphic. * * *
polymorphousperverse
polymorphous perverse adj. Characterized by or displaying sexual tendencies that have no specific direction, as in an infant or young child, but that may evolve into acts that ...
polymyalgia rheumatica
/pol'ee muy al"jee euh roo mat"i keuh, -al"jeuh/, Pathol. a chronic inflammatory disease, common among older persons, characterized by recurrent episodes of muscle pain and ...
polymyositis
▪ pathology       chronic, progressive inflammation of skeletal muscles (muscle), particularly the muscles of the shoulders and pelvis.       Initially muscles ...
polymyxin
/pol'ee mik"sin/, n. Pharm. any of various polypeptide antibiotics derived from Bacillus polymyxa. [1945-50; < NL polymyx(a) specific epithet ( < Gk poly- POLY- + mýxa mucus, ...
Polynesia
/pol'euh nee"zheuh, -sheuh/, n. one of the three principal divisions of Oceania, comprising those island groups in the Pacific lying E of Melanesia and Micronesia and extending ...
Polynesian
/pol'euh nee"zheuhn, -sheuhn/, adj. 1. of or pertaining to Polynesia, its inhabitants, or their languages. n. 2. a member of any of a number of brown-skinned peoples, variously ...
Polynesian culture
▪ cultural region, Pacific Ocean Introduction  the beliefs and practices of the indigenous peoples of the ethnogeographic group of Pacific Islands known as Polynesia (from ...
Polynesian languages
      group of about 30 languages belonging to the Eastern, or Oceanic, branch of the Austronesian (Malayo-Polynesian) language family and most closely related to the ...
polyneuritic
See polyneuritis. * * *
polyneuritis
—polyneuritic /pol'ee noo rit"ik, -nyoo-/, adj. /pol'ee noo ruy"tis, -nyoo-/, n. Pathol. inflammation of several nerves at the same time; multiple neuritis. [1885-90; POLY- + ...
Polynices
/pol'euh nuy"seez/, n. Class. Myth. a son of Oedipus and Jocasta and brother of Eteocles and Antigone on whose behalf the Seven against Thebes were organized. * * *
polynomial
/pol'euh noh"mee euhl/, adj. 1. consisting of or characterized by two or more names or terms. n. 2. Algebra. a. (in one variable) an expression consisting of the sum of two or ...
polynomial ring
Math. the set of all polynomials in an indeterminate variable with coefficients that are elements of a given ring. * * *
polynuclear
/pol'ee nooh"klee euhr, -nyooh"-/ or, by metathesis, /-kyeuh leuhr/, adj. having many nuclei. Also, polynucleate /pol'ee nooh"klee it, -ayt', -nyooh"-/. [1875-80; POLY- + ...
polynucleotide
/pol'ee nooh"klee euh tuyd', -nyooh"-/, n. Biochem. a sequence of nucleotides, as in DNA or RNA, bound into a chain. [1910-15; POLY- + NUCLEOTIDE] * * *
polynya
/peuh lin"yeuh/, n. an area of unfrozen sea water surrounded by ice. [1850-55; < Russ polyn'yá, ORuss polynii equiv. to pol(u) empty, open + -ynii n. suffix] * * * ▪ ...
polyoestrous
/pol'ee es"treuhs, -ee"streuhs/, adj. polyestrous. * * *
polyol
/pol"ee awl', -ol'/, n. Chem. an alcohol containing three or more hydroxyl groups; a polyhydric alcohol. Also called polyalcohol. [POLY- + -OL1] * * *
polyolefin
/pol'ee oh"leuh fin/, n. Chem. any of a group of thermoplastic, stiff, light, and hard polymers obtained from the polymerization of simple olefins like propylene, used for ...
polyoma
pol·y·o·ma (pŏl'ē-ōʹmə) n. A small form of the papovavirus that contains DNA and is associated with the formation of various tumors in rodents. Also called polyoma ...
polyoma virus
/pol'ee oh"meuh/ a small DNA-containing virus, of the papovavirus group, that can produce a variety of tumors in mice, hamsters, rabbits, and rats. [1955-60; POLY- + -OMA] * * ...
polyomavirus
polyomavirus [päl΄ē ō′mə vī΄rəs] n. 〚 POLY- + -OMA〛 any of a genus (Polyomavirus) of papovaviruses that naturally infect wild and laboratory mice, and that cause ...
polyonymous
—polyonymy, n. /pol'ee on"euh meuhs/, adj. having or known by several or many names. [1670-80; < Gk polyónymos, equiv. to poly- POLY- + -onymos -named, adj. deriv. of ónyma, ...
polyp
—polypous, adj. /pol"ip/, n. 1. Zool. a. a sedentary type of animal form characterized by a more or less fixed base, columnar body, and free end with mouth and tentacles, esp. ...
polypary
—polyparian /pol'euh pair"ee euhn/, adj. /pol"euh per'ee/, n., pl. polyparies. the common supporting structure of a colony of polyps, as corals. [1740-50; < NL polyparium. See ...
Polypay
Pol·y·pay (pŏlʹē-pā') n. Any of a breed of beige-colored sheep developed in the United States, raised for meat and wool and valued for their hardiness and frequent ...
polyped
/pol"ee ped'/, n. 1. a being or object having many legs: Her favorite toy is a bug-shaped polyped. adj. 2. having many legs: a polyped table. [1815-25; POLY- + -PED, perh. on the ...
polypeptide
/pol'ee pep"tuyd, -tid/, n. Biochem. a chain of amino acids linked together by peptide bonds and having a molecular weight of up to about 10,000. [1900-05; POLY- + PEPTIDE] * * *
polypetalous
—polypetaly, n. /pol'ee pet"l euhs/, adj. Bot. having a corolla of separate petals. [1695-1705; POLY- + PETALOUS] * * *
polyphagia
—polyphagian, n., adj. —polyphagist /peuh lif"euh jist/, n. —polyphagous /peuh lif"euh geuhs/, polyphagic /pol'ee faj"ik, -fay"jik/, adj. /pol'ee fay"jee euh, -jeuh/, n. 1. ...
polyphagian
See polyphagia. * * *
polyphagous
po·lyph·a·gous (pə-lĭfʹə-gəs) adj. Feeding on many different kinds of food: polyphagous insects or birds. * * *
polypharmacy
/pol'ee fahr"meuh see/, n. Pharm. the use of two or more drugs together, usually to treat a single condition or disease. [1755-65; POLY- + PHARMACY] * * *
polyphase
/pol"ee fayz'/, adj. Elect. 1. having more than one phase. 2. of or pertaining to a set of alternating currents that have the same frequency but different phases and that enter a ...
polyphasic
/pol'ee fay"zik/, adj. 1. having more than two phases. 2. habitually doing more than one thing at a time: a polyphasic personality. [1920-25; POLYPHASE + -IC] * * *
Polyphemus
/pol'euh fee"meuhs/, n. Class. Myth. a Cyclops who was blinded by Odysseus. * * * In Greek mythology, a Cyclops. He was the son of Poseidon and the nymph Thoösa. When Odysseus ...
Polyphemus moth
a large, yellowish-brown American silkworm moth, Antheraea polyphemus, having a prominent eyespot on each hind wing and feeding on cherry, apple, and other trees. * * *
polyphemusmoth
pol·y·phe·mus moth (pŏl'ə-fēʹməs) n. A large North American silkworm moth (Antheraea polyphemus) having an eyelike spot on each hind wing.   [After Polyphemus, from the ...
polyphenol
/pol'ee fee"nawl, -nol/, n. Chem. a polymeric phenol. [1895-1900; POLY- + PHENOL] * * *
polyphone
/pol"ee fohn'/, n. Phonet. a polyphonic letter or symbol. [1645-55; < Gk polýphonos. See POLY-, -PHONE] * * *
polyphonic
—polyphonically, adv. /pol'ee fon"ik/, adj. 1. consisting of many voices or sounds. 2. Music. a. having two or more voices or parts, each with an independent melody, but all ...
polyphonic prose
prose characterized by the use of poetic devices, as alliteration, assonance, rhyme, etc., and esp. by an emphasis on rhythm not strictly metered. [1915-20] * * * ▪ ...
polyphonically
See polyphonic. * * *
polyphonous
See polyphony. * * *
polyphonously
See polyphonous. * * *
polyphony
—polyphonous, adj. —polyphonously, adv. /peuh lif"euh nee/, n. 1. Music. polyphonic composition; counterpoint. 2. Phonet. representation of different sounds by the same ...
polyphyletic
—polyphyletically, adv. /pol'ee fuy let"ik/, adj. developed from more than one ancestral type, as a group of animals. [1870-75; POLY- + PHYLETIC] * * *
polyphyletically
See polyphyletic. * * *
polypide
polypide [päl′ip īd΄, päl′ipid] n. 〚 POLYP + -ide (var. of -ID)〛 ZOOID (n. 2) * * *
polyploid
—polyploidic, adj. —polyploidy, n. /pol"ee ployd'/, Biol. adj. 1. having a chromosome number that is more than double the basic or haploid number. n. 2. a polyploid cell or ...
polyploidy
See polyploid. * * * ▪ genetics       the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes. In other words, ...
polypnea
/pol'ip nee"euh/, n. Med. rapid breathing; panting. Also, polypnoea. [1885-90; POLY- + -PNEA] * * *
polypneic
See polypnea. * * *
polypod
/pol"ee pod'/, adj. (of insect larvae) having many feet. [ < It (1913) < Gk, s. of polýpous many-footed; see POLYP] * * *
Polypodiaceae
▪ fern family       family (including Grammitidaceae) in the order Polypodiales, which contains 56 genera and about 1,200 species of diverse and widely distributed ...
polypody
/pol"ee poh'dee/, n., pl. polypodies. any fern of the genus Polypodium, as P. vulgare, having creeping rootstocks, deeply pinnatifid evergreen fronds, and round, naked ...
polypoid
/pol"euh poyd'/, adj. Pathol. resembling a polyp. [1835-45; POLYP + -OID] * * *
Polyporales
▪ order of fungi       large order of pore fungi within the phylum Basidiomycota (kingdom Fungi). The 2,300 known species have conspicuous sporophores (fruiting bodies), ...
polypore
/pol"ee pawr', -pohr'/, n. a woody pore fungus, Laetiporus (Polyporus) sulphureus, that forms large, brightly colored, shelflike growths on old logs and tree stumps. [1900-05; < ...
polyposis
/pol'euh poh"sis/, n. Pathol. the development of numerous polyps on a hollow internal organ, seen esp. in the intestinal tract. [1910-15; POLYP + -OSIS] * * *
polypous
/pol"euh peuhs/, adj. polypoid. [1740-50; POLYP + -OUS] * * *
polypropylene
/pol'ee proh"peuh leen'/, n. Chem. a plastic polymer of propylene, (C3H5)n, used chiefly for molded parts, electrical insulation, packaging, and fibers for wearing ...
polyprotic
/pol'ee prot"ik/, adj. Chem. (of an acid) having two or more transferable protons. [1940-45; POLY- + PROT(ON) + -IC] * * *
polyptoton
▪ literature       the rhetorical repetition within the same sentence of a word in a different case, inflection, or voice or of etymologically related words in different ...
polyptych
/pol"ip tik/, n. a work of art composed of several connected panels. Cf. diptych, pentaptych, triptych. [1855-60; special use of LL polyptychum < Gk polýptychon a register, ...
polyrhythm
—polyrhythmic, adj. —polyrhythmically, adv. /pol"ee ridh'euhm/, n. Music. the simultaneous occurrence of sharply contrasting rhythms within a composition. [1925-30; POLY- + ...
polyrhythmic
See polyrhythm. * * *
polyribonucleotide
pol·y·ri·bo·nu·cle·o·tide (pŏl'ē-rī'bō-no͞oʹklē-ə-tīd', -nyo͞oʹ-) n. An oligonucleotide consisting of a number of ribonucleotides. * * *
polyribosome
/pol'ee ruy"beuh sohm'/, n. Biol. polysome. [1960-65; POLY- + RIBOSOME] * * *
polysaccharide
/pol'ee sak"euh ruyd', -rid/, n. Chem. a carbohydrate, as starch, inulin, or cellulose, containing more than three monosaccharide units per molecule, the units being attached to ...
polysaprobic
polysaprobic [päl΄isə prō′bik] adj. 〚 POLY- + SAPROBIC〛 Biol. flourishing in a body of water having a heavy load of decomposed organic matter and almost no free ...
polysemous
pol·y·se·mous (pŏl'ē-sēʹməs) adj. Having or characterized by many meanings: highly polysemous words such as play and table.   [From Late Latin polysēmus, from Greek ...
polysemy
—polysemous, adj. /pol"ee see'mee, peuh lis"euh mee/, n. diversity of meanings. [1895-1900; < NL polysemia, equiv. to LL polysem(us) with many significations ( < Gk polýsemos, ...
polysepalous
/pol'ee sep"euh leuhs/, adj. Bot. having a calyx of separate or unconnected sepals. [1820-30; POLY- + -SEPALOUS] * * *
polysome
/pol"ee sohm'/, n. Biol. a complex of ribosomes strung along a single strand of messenger RNA that translates the genetic information coded in the messenger RNA during protein ...

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