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planegeometry
plane geometry n. The geometry of planar figures. * * *
planeload
planeload [plān′lōd΄] n. 1. all the freight or passengers that an airplane can carry or contain 2. the load carried by an airplane * * * plane·load (plānʹlōd') n. The ...
planeness
See plane1. * * *
planer
/play"neuhr/, n. 1. Carpentry. a power machine for removing the rough or excess surface from a board. 2. Metalworking. a machine for cutting flat surfaces, having a cutting tool ...
planer saw
Carpentry. a hollow-ground circular saw for ripping and cutting across grain, having raker teeth for clearing away the chips cut by the cutting teeth. * * *
planer tree
/play"neuhr/ a small tree, Planera aquatica, of the elm family, growing in moist ground in the southern U.S., bearing a small, ovoid, nutlike fruit and yielding a compact ...
planertree
pla·ner tree (plāʹnər) n. A small, deciduous, elmlike swamp tree (Planera aquatica) of the southern United States, having small, ribbed, nutlike fruit. Also called water ...
planeside
plane·side (plānʹsīd') n. The area adjacent to an airplane. * * *
planet
/plan"it/, n. 1. Astron. a. Also called major planet. any of the nine large heavenly bodies revolving about the sun and shining by reflected light: Mercury, Venus, Earth, Mars, ...
planet gear
Mach. any of the gears in an epicyclic train surrounding and engaging with the sun gear. Also called planet wheel. [1915-20] * * *
Planet Hollywood{™}
an international chain of fashionable restaurants, originally partly owned by Demi Moore, Arnold Schwarzenegger, Sylvester Stallone and Bruce Willis. The first was opened in the ...
Planet of the Apes
a US film (1968) about a planet on which apes are the rulers and humans have become like animals. Several later films continued the story. There was also a television series in ...
planet wheel
planet wheel n. a gear that meshes with and revolves around another gear in an epicyclic train * * *
planet X
/eks/, Astron. a tenth planet beyond the orbit of Pluto whose existence has been hypothesized but not confirmed. * * * Supposed distant planet of the solar system, hypothesized ...
planet-stricken
planet-stricken [plan′itstruk΄plan′it strik΄ən] adj. Archaic 1. believed to be adversely affected mentally or physically by the planets 2. PANIC-STRICKEN: Also ...
planet-struck
/plan"it struk'/, adj. 1. affected adversely by the supposed influence of a planet. 2. stricken with terror; panic-stricken. Also, planet-stricken /plan"it ...
planetable
plane table n. A portable surveying instrument consisting essentially of a drawing board and a ruler mounted on a tripod and used to sight and map topographical details. * * *
planetarian
plan·e·tar·i·an (plăn'ĭ-târʹē-ən) n. 1. A member of the professional staff of a planetarium. 2. An inhabitant of a planet.   plan'e·tarʹi·an adj. * * *
planetarium
/plan'i tair"ee euhm/, n., pl. planetariums, planetaria /-tair"ee euh/. 1. an apparatus or model representing the planetary system. 2. a device that produces a representation of ...
planetary
/plan"i ter'ee/, adj. 1. of, pertaining to, or resembling a planet or the planets. 2. wandering; erratic. 3. terrestrial; global. 4. Mach. noting or pertaining to an epicyclic ...
Planetary data for Earth
▪ Table Planetary data for Earth mean distance from Sun 149,600,000 km (1.0 AU) eccentricity of orbit 0.0167 inclination of orbit to ecliptic 0.000° Earth year (sidereal ...
Planetary data for Jupiter
▪ Table Planetary data for Jupiter mean distance from Sun 778,000,000 km (5.2 AU) eccentricity of orbit 0.049 inclination of orbit to ecliptic 1.3° Jovian year (sidereal ...
Planetary data for Mars
▪ Table Planetary data for Mars mean distance from Sun 227,941,040 km (1.5 AU) eccentricity of orbit 0.093 399 inclination of orbit to ecliptic 1.850 20° Martian year ...
Planetary data for Mercury
▪ Table Planetary data for Mercury mean distance from Sun 57,910,000 km (0.4 AU) eccentricity of orbit 0.2056 inclination of orbit to ecliptic 7.004° Mercurian year ...
Planetary data for Neptune
▪ Table Planetary data for Neptune mean distance from Sun 4,498,250,000 km (30.1 AU) eccentricity of orbit 0.0086 inclination of orbit to ecliptic 1.77° Neptunian year ...
Planetary data for Saturn
▪ Table Planetary data for Saturn mean distance from Sun 1,427,000,000 km (9.5 AU) eccentricity of orbit 0.054 inclination of orbit to ecliptic 2.5° Saturnian year ...
Planetary data for Uranus
▪ Table Planetary data for Uranus mean distance from Sun 2,870,990,000 km (19.2 AU) eccentricity of orbit 0.0461 inclination of orbit to ecliptic 0.774° Uranian year ...
Planetary data for Venus
▪ Table Planetary data for Venus mean distance from Sun 108,200,000 km (0.72 AU) eccentricity of orbit 0.007 inclination of orbit to ecliptic 3.4° Venusian year (sidereal ...
planetary nebula
Astron. an expanding shell of thin ionized gas that is ejected from and surrounds a hot, dying star of about the same mass as the sun; the gas absorbs ultraviolet radiation from ...
planetary precession
Astron. the small component of the precession of the equinoxes contributed by the motion of the ecliptic, the change in orientation of the plane of the earth's orbit being ...
planetarynebula
planetary nebula n. A nebula, such as the Ring Nebula, consisting of a hot, blue-white, central star surrounded by an envelope of expanding gas. * * *
planetesimal
/plan'i tes"euh meuhl/, Astron. n. 1. one of the small celestial bodies that, according to one theory (planetesimal hypothesis), were fused together to form the planets of the ...
planetesimal hypothesis
planetesimal hypothesis n. any of several theories postulating that the solar system originated with planetesimals * * *
planetesimalhypothesis
planetesimal hypothesis n. The hypothesis that the planets and satellites of the solar system were formed by gravitational aggregation of planetesimals. * * *
planetoid
—planetoidal, adj. /plan"i toyd'/, n. Astron. an asteroid. [1795-1805; PLANET + -OID] * * *
planetoidal
See planetoid. * * *
planetological
See planetology. * * *
planetologist
See planetological. * * *
planetology
—planetological /plan'i tl oj"i keuhl/, adj. —planetologist, n. /plan'i tol"euh jee/, n. the branch of astronomy that deals with the physical features of the ...
planetree
plane tree n. Any of several trees of the genus Platanus, having ball-shaped fruit clusters and, usually, outer bark that flakes off in patches. * * *
Planets
a popular piece of music for orchestra by the British composer Gustav Holst, which had its first complete public performance in 1920. Each of its seven sections has the name of ...
planets of other stars
or extrasolar planets Planets that orbit stars other than the Sun. The existence of extrasolar planets, many light-years from Earth, was confirmed in the early 1990s with the ...
planetwheel
planet wheel n. One of the small gear wheels in an epicyclic train. * * *
planform
/plan"fawrm'/, n. the outline of an object viewed from above. [1905-10; PLAN + FORM] * * *
plangency
See plangent. * * *
plangent
—plangency, n. —plangently, adv. /plan"jeuhnt/, adj. resounding loudly, esp. with a plaintive sound, as a bell. [1815-25; < L plangent- (s. of plangens), prp. of plangere to ...
plangently
See plangency. * * *
planh
/plah"nyeu/, n. a Provençal elegiac poem. [1835-45; < Pr < L planctus a striking, beating, lamentation. See PLAINT] * * *
plani-
var. of plano-1: planigraph. * * *
planiform
/play"neuh fawrm', plan"euh-/, adj. having a flattened shape, as an anatomical joint. [1820-30; PLANI- + -FORM] * * *
planify
—planification, n. /plan"euh fuy'/, v.t., v.i., planified, planifying. Informal. to plan in great detail. [1970-75; < F planifier to organize (economic activity) according to a ...
planigale
      any of several species of tiny mouselike marsupial animals. See marsupial mouse. * * *
planigraph
—planigraphy /pleuh nig"reuh fee/, n. /play"ni graf', -grahf', plan"i-/, n. Med. an x-ray photograph in which a given plane of the body is well defined and those above and ...
planimeter
/pleuh nim"i teuhr/, n. an instrument for measuring mechanically the area of plane figures. [1855-60; PLANI- + -METER] * * * ▪ mathematical ...
planimetric
See planimeter. * * *
planimetrical
See planimetric. * * *
planimetrically
See planimetric. * * *
planimetry
—planimetric /plan'euh me"trik, play'neuh-/, planimetrical, adj. /pleuh nim"i tree/, n. the measurement of plane areas. [1350-1400; ME planemetrie < ML planimetria; see PLANI-, ...
planing hull
Naut. a hull that tends to rise from the water when under way so that no significant amount of water is displaced beyond a certain speed. Cf. displacement hull. * * *
planish
—planisher, n. /plan"ish/, v.t. 1. to give a smooth finish to (metal) by striking lightly with a smoothly faced hammer or die. 2. to give a smooth finish to (metal, paper, ...
planisher
See planish. * * *
planisphere
—planispherical /plan'euh sfer"i keuhl, -sfear"-, play'neuh-/, planispheric, planispheral /plan'i sfear"euhl, play'neuh-/, adj. /plan"euh sfear', play"neuh-/, n. 1. a map of ...
planispheric
See planisphere. * * *
planispherical
See planispheric. * * *
plank
—plankless, adj. —planklike, adj. /plangk/, n. 1. a long, flat piece of timber, thicker than a board. 2. lumber in such pieces; planking. 3. something to stand on or to cling ...
plank floor
Shipbuilding. a floor made from sawed, straight-grained timber. * * *
planking
/plang"king/, n. 1. planks collectively, as in a floor. 2. the act of laying or covering with planks. [1485-95; PLANK + -ING1] * * *
plankter
/plangk"teuhr/, n. any organism that is an element of plankton. [1935-40; < Gk planktér roamer. See PLANKTON] * * *
plankton
—planktonic /plangk ton"ik/, adj. /plangk"teuhn/, n. the aggregate of passively floating, drifting, or somewhat motile organisms occurring in a body of water, primarily ...
planktonic
See plankton. * * *
planned economy
an economic system in which the government controls and regulates production, distribution, prices, etc. Cf. free enterprise. [1930-35] * * *
planned obsolescence
a method of stimulating consumer demand by designing products that wear out or become outmoded after limited use. Also called built-in obsolescence. [1965-70] * * *
Planned Parenthood
Trademark. an organization offering counseling and health-care services for family planning and for venereal disease and other reproductive problems. * * * also called  family ...
Planned Parenthood Federation of America
▪ American family planning, social service organization       American organization that, since its founding in 1942, has worked as an advocate for education and ...
Planned Parenthood of Southeastern Pennsylvania v. Casey
▪ law case       legal case, decided by the U.S. Supreme Court in 1992, that redefined several provisions regarding abortion rights as established in Wade (Roe v. ...
Planned Parenthood{™} Federation of America
(Planned Parenthood ) a private US organization that gives free information and advice on planning a family. It was established in 1916 and has nearly 850 local branches, with ...
planner
/plan"euhr/, n. 1. a person who plans. 2. a book, similar to a desk calendar, for recording appointments, things to be done, etc. [1710-20; PLAN + -ER1] * * *
planning
/plan"ing/, n. the act or process of making a plan or plans. [1740-50; PLAN + -ING1] * * * (as used in expressions) economic planning family planning urban planning * * *
plano
/play"noh/, adj. pertaining to eyeglasses that do not contain a curvature for correcting vision defects: plano sunglasses. [1945-50; independent use of PLANO-1] * * * ▪ ...
Plano
/play"noh/, n. a town in N Texas. 72,331. * * * ▪ Texas, United States       city, Collin and Denton counties, northern Texas, U.S., located about 16 miles (26 km) ...
plano-
plano-1 a combining form meaning "flat," "plane," used in the formation of compound words: planography. Also, plani-; esp. before a vowel, plan-. [comb. form repr. L planus ...
plano-concave
/play'noh kon"kayv, -kon kayv"/, adj. Optics. pertaining to or noting a lens that is plane on one side and concave on the other. See diag. under lens. [1685-95; PLANO-1 + ...
plano-convex
/play'noh kon"veks, -kon veks", -keuhn-/, adj. Optics. pertaining to or noting a lens that is plane on one side and convex on the other. See diag. under lens. [1655-65; PLANO-1 + ...
planoblast
—planoblastic, adj. /plan"euh blast'/, n. Zool. the medusa of a hydroid. [1870-75; PLANO-2 + -BLAST] * * *
planoconcave
pla·no·con·cave (plā'nō-kŏn-kāvʹ, -kŏnʹkāv') adj. Flat on one side and concave on the other: a planoconcave lens. * * *
planoconvex
pla·no·con·vex (plā'nō-kŏn-vĕksʹ, -kŏnʹvĕks') adj. Flat on one side and convex on the other: a planoconvex lens. * * *
planogamete
/plan'oh gam"eet, plan"euh geuh meet'/, n. Biol. a motile gamete. [1885-90; PLANO-2 + GAMETE] * * *
planograph
/play"neuh graf', -grahf', plan"euh-/, Print. v.t. 1. (formerly) to print from a flat surface. n. 2. (formerly) an impression so produced. [PLANO-1 + -GRAPH] * * *
planographic
See planography. * * *
planographically
See planographic. * * *
planography
—planographic /play'neuh graf"ik, plan'euh-/, adj. —planographically, adv. /pleuh nog"reuh fee/, n. Print. the art or technique of printing from a flat surface directly or by ...
planometer
—planometry, n. /pleuh nom"i teuhr/, n. Mach. See surface plate. [1860-65, Amer.; PLANO-1 + -METER] * * *
planometry
See planometer. * * *
planosol
planosol [plā′nə säl΄, plā′nəsôl΄] n. 〚
planospore
/plan"euh spawr', -spohr'/, n. Biol. a zoospore. [1945-50; PLANO-2 + SPORE] * * *
Planquette, Robert
▪ French composer in full  Jean-Robert Planquette   born July 31, 1848, Paris died Jan. 28, 1903, Paris       French composer of operettas and other light music. ...
plansheer
/plan"shear/, n. plancer. * * *
plant
—plantable, adj. —plantless, adj. —plantlike, adj. /plant, plahnt/, n. 1. any member of the kingdom Plantae, comprising multicellular organisms that typically produce their ...
plant breeding
Introduction       application of genetic (genetics) principles to produce plants that are more useful to humans. This is accomplished by selecting plants found to be ...
plant bug
any of numerous, often brightly colored hemipterous insects of the family Miridae that feed on the juices of plants. Also called capsid, leaf bug. [1855-60, Amer.] * * * ▪ ...
Plant City
a city in W Florida. 19,270. * * *
plant development
Introduction       a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells ...
plant disease
▪ plant pathology Introduction       an impairment of the normal state of a plant that interrupts or modifies its vital functions.       All species of plants, ...
Plant disease symptoms
▪ Table Plant disease symptoms description and causes examples prenecrotic symptom expression that precedes the death of cells or the disintegration of ...
plant food
nourishment, as fertilizer or chemicals, for plants. [1865-70] * * *
plant hopper
▪ insect       any member of several insect families of the order Homoptera, easily recognized because of the hollow, enlarged head extension that may appear luminous ...
plant hormone
plant hormone n. an organic chemical, as auxin, produced by plant cells and functioning at various sites to regulate growth, turning, metabolic processes, etc. * * *
plant kingdom
the plants of the world collectively. Also called vegetable kingdom. Cf. animal kingdom, mineral kingdom. [1880-85] * * *
plant louse
1. aphid. 2. any of various related insects having similar habits. [1795-1805] * * *
plant pathology
the branch of botany dealing with diseases of plants. Also, phytopathology. [1890-95] * * *
plant virus
Any of various viruses that can cause plant disease (e.g., the tobacco mosaic virus). Plant viruses are economically important because many of them infect crop and ornamental ...
plant-cutter
/plant"kut'euhr, plahnt"-/, n. any of several South American, passerine birds of the family Phytotomidae, superficially resembling grosbeaks but having serrated edges on the bill ...
planta genista
/plan"teuh/, Heraldry. a representation of a sprig of broom: used as a badge of the Plantagenets. [ < NL: broom plant; see PLANT, GENISTA] * * *
plantable
See plant. * * *
Plantae
/plan"tee/, n. (used with a pl. v.) Biol. the taxonomic kingdom comprising all plants. [ < NL, L: pl. of planta PLANT] * * *
Plantagenet
/plan taj"euh nit/, n. a member of the royal house that ruled England from the accession of Henry II in 1154 to the death of Richard III in 1485. * * *
Plantagenet, House of
or House of Anjou Royal house of England (1154–1485) that provided 14 kings, including six from the cadet houses of Lancaster and York. The line descended from Geoffrey, count ...
Plantago
▪ plant genus       a genus in the family Plantaginaceae (order Lamiales) with about 265 species. The small plants usually have a dense tuft of basal leaves and long, ...
plantain
plantain1 /plan"tin, -tn/, n. 1. a tropical plant, Musa paradisiaca, of the banana family, resembling the banana. 2. its fruit, eaten cooked as a staple food in tropical ...
plantain lily
any Japanese or Chinese plant of the genus Hosta, of the lily family, having large leaves and spikes or one-sided clusters of white, lilac, or blue flowers. [1880-85] * * * ▪ ...
plantain-eater
/plan"tin ee'teuhr, -tn-/, n. any of various touracos, erroneously believed to feed chiefly on plantains and bananas. [1795-1805] * * *
plantainlily
plantain lily n. Any of several eastern Asian plants of the genus Hosta, widely cultivated for their clumps of long-lasting foliage and their white, blue, or lilac flowers borne ...
plantar
/plan"teuhr/, adj. Anat., Zool. of or pertaining to the sole of the foot. [1700-10; < L plantaris, equiv. to plant(a) sole of the foot + -aris -AR1] * * *
plantar reflex
a normal reflex flexion of the toes, esp. in persons above one year of age, resulting from stroking the sole of the foot. Cf. Babinski's reflex. * * *
plantation
—plantationlike, adj. /plan tay"sheuhn/, n. 1. a usually large farm or estate, esp. in a tropical or semitropical country, on which cotton, tobacco, coffee, sugar cane, or the ...
Plantation
/plan tay"sheuhn/, n. a town in S Florida. 48,501. * * *
Plantation walking horse.
See Tennessee walking horse. * * *
plantbug
plant bug n. An insect of the order Hemiptera whose mouthparts are adapted for piercing plants and sucking their juices. * * *
plantcutter
▪ bird       any of three species of South American birds of the family Phytotomidae (order Passeriformes), with finely serrated, stout bills used for snipping off ...
Plante
/plahnt/; Fr. /plahonnt/, n. Jacques /zhahk/, 1929-86, Canadian ice-hockey player. * * *
Plante, (Joseph) Jacques (Omer)
born Jan. 17, 1929, Shawinigan Falls, Que., Can. died Feb. 26, 1986, Geneva, Switz. Canadian ice-hockey player. A goalie, he recorded a shutout in his first NHL game. He was an ...
Planté, Francis
▪ French pianist born March 2, 1839, Orthez, France died Dec. 19, 1934, St.-Avit       French pianist active in Paris in the late 19th century.       Planté ...
Planté, Gaston
▪ French physicist born April 22, 1834, Orthez, France died May 21, 1889, Paris       French physicist who produced the first electric storage battery, or accumulator, ...
Plante, Jacques
▪ Canadian athlete in full  Joseph Jacques Omer Plante,  byname  Jake The Snake  born Jan. 17, 1929, Shawinigan Falls, Quebec, Can. died Feb. 26, 1986, Geneva, ...
planter
/plan"teuhr, plahn"-/, n. 1. a person who plants. 2. an implement or machine for planting seeds in the ground. 3. the owner or manager of a plantation. 4. Hist. a colonist or new ...
planter's punch
a punch made with rum, lime juice, sugar, and water or soda. [1840-50] * * *
planter'spunch
plant·er's punch (plănʹtərz) n. A drink of rum with lemon or lime juice, sugar syrup, water or soda, bitters, and grenadine. * * *
planthopper
/plant"hop'euhr, plahnt"-/, n. any member of a large and varied group of homopterous insects that are related to the leafhoppers and the spittlebugs but rarely damage cultivated ...
planthormone
plant hormone n. Any of various hormones produced by plants that control or regulate germination, growth, metabolism, or other physiological activities. Also called ...
plantigrade
/plan"ti grayd'/, adj. 1. walking on the whole sole of the foot, as humans, and bears. n. 2. a plantigrade animal. [1825-35; < NL plantigradus, equiv. to L plant(a) sole + -i- ...
Plantin
/plahonn taonn"/, n. Christophe /krddee stawf"/, c1520-1589, French typographer. * * *
Plantin, Christophe
▪ French printer born c. 1520, , Saint-Avertin, France died July 1, 1589, Antwerp, Belg.       French printer, founder of an important printing house and publisher of ...
planting
planting [plant′iŋ] n. 1. the act or an instance of putting seeds or young plants into the soil [floods delayed spring planting] 2. something planted, as in a decorative ...
plantkingdom
plant kingdom n. A main classification of living organisms that includes all plants. Also called vegetable kingdom. See table at taxonomy. * * *
plantlet
/plant"lit, plahnt"-/, n. a little plant, as one produced on the leaf margins of a kalanchoe or the aerial stems of a spider plant. [1810-20; PLANT + -LET] * * *
plantlouse
plant louse n. See aphid. * * *
plantocracy
plan·toc·ra·cy (plăn-tŏkʹrə-sē) n. pl. plan·toc·ra·cies 1. A ruling class formed of plantation owners. 2. Leadership or government by this class.   [plantation + ...
plantsman
/plants"meuhn, plahnts"-/, n., pl. plantsmen. 1. a nurseryman. 2. a horticulturist. 3. a person with a keen interest in and wide knowledge of plants and their ...
plantswoman
/plants"woom'euhn, plahnts"-/, n., pl. plantswomen. 1. a nurserywoman. 2. a horticulturist. 3. a woman with a keen interest in and wide knowledge of plants and their ...
Planudes, Maximus
orig. Manuel Planudes born 1260, Nicomedia, Byzantine Empire died с 1310, Constantinople Greek Orthodox scholar, anthologist, and polemicist. He established a school in ...
planula
—planular, planulate /plan"yeuh layt'/, adj. /plan"yeuh leuh/, n., pl. planulae /-lee'/. Zool. the ciliate, free-swimming larva of a coelenterate. [1865-70; < NL, dim. of L ...
planular
See planula. * * *
planulate
See planular. * * *
plaque
/plak/, n. 1. a thin, flat plate or tablet of metal, porcelain, etc., intended for ornament, as on a wall, or set in a piece of furniture. 2. an inscribed commemorative tablet, ...
Plasencia
▪ Spain  city, Cáceres provincia (province), in the Extremadura comunidad autónoma (autonomous community), western Spain. It lies on the Jerte River in the Plasencia ...
plash
plash1 —plashingly, adv. /plash/, n. 1. a gentle splash. 2. a pool or puddle. v.t., v.i. 3. to splash gently. [bef. 1000; ME plasch pool, puddle, OE plaesc; c. D, LG plas, ...
plashy
/plash"ee/, adj., plashier, plashiest. 1. marshy; wet. 2. splashing. [1545-55; PLASH1 + -Y1] * * *
Plaskett, John Stanley
▪ Canadian astronomer born Nov. 17, 1865, Woodstock, Ont., Canada died Oct. 17, 1941, Victoria, B.C.       Canadian astronomer remembered for his expert design of ...
plasm
plasm [plaz′əm] n. PLASMA (senses 2 & 3) * * * plasm (plăzʹəm) n. 1. See germ plasm. 2. Variant of plasma. * * *
plasm-
var. of plasmo- before a vowel: plasmapheresis. * * *
plasma
—plasmatic /plaz mat"ik/, plasmic, adj. /plaz"meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. ...
plasma cell
Anat. an antibody-secreting cell, derived from B cells, that plays a major role in antibody-mediated immunity. Also called plasmacyte /plaz"meuh suyt'/. [1885-90] * * *
plasma membrane
Cell Biol. See cell membrane. [1895-1900] * * *
Plasma membrane lipid composition
▪ Table Plasma membrane lipid composition by weight percent of mammalian red blood ...
plasma oscillation
▪ physics       in physics, the organized motion of electrons or ions in a plasma. Each particle in a plasma assumes a position such that the total force resulting from ...
plasma thromboplastic component
Biochem. See Christmas factor. * * *
plasmaball
plasma ball n. A glass ball containing low density gas surrounding an electrode, which stimulates the gas to glow in random, moving streams of light. * * *
plasmablast
plas·ma·blast (plăzʹmə-blăst') n. The precursor or stem cell of a plasma cell. * * *
plasmacell
plasma cell n. Any of the antibody-secreting cells found in lymphoid tissue and derived from B cells upon lymphokine stimulation and reaction with a specific antigen. Also called ...
plasmacyte
plas·ma·cyte (plăzʹmə-sīt') n. See plasma cell. * * *
plasmagel
/plaz"meuh jel'/, n. the gelatinous outer layer of cytoplasm of the pseudopod of an ameba, beneath the cell membrane. [1920-25; PLASMA + GEL] * * *
plasmagene
plasmagene [plaz′mə jēn΄] n. 〚 PLASMA + GENE〛 any cytoplasmic structure or substance thought to carry inherited characteristics to a subsequent generation but not in a ...
plasmagenic
See plasmagene. * * *
plasmalemma
/plaz'meuh lem"euh/, n., pl. plasmalemmas. Cell Biol. See cell membrane. [1920-25; PLASMA + Gk lémma husk (see LEMMA2)] * * *
plasmalogen
/plaz mal"euh jin, -jen'/, n. Biochem. any of the class of phosphatides that contain an aldehyde of a fatty acid, found in heart and skeletal muscle, the brain, the liver, and in ...
plasmamembrane
plasma membrane n. See cell membrane. * * *
plasmapause
/plaz"meuh pawz'/, n. Astron. the boundary of the plasmasphere, where the particle density decreases very rapidly. [1965-70; PLASMA + PAUSE] * * * ▪ atmospheric ...
plasmapheresis
/plaz'meuh feuh ree"sis/, n. Med. a type of apheresis in which blood cells are returned to the bloodstream of the donor and the plasma is used, as for tranfusion. [1915-20; ...
plasmaphysics
the branch of physics that deals with plasmas and their interactions with electric and magnetic fields. * * *
plasmasol
/plaz"meuh sawl', -sol'/, n. the relatively fluid, inner cytoplasm of a pseudopod of an ameba. [1920-25; PLASMA + SOL4] * * *
plasmasphere
/plaz"meuh sfear'/, n. Astron. a region of cool plasma surrounding the earth, extending 8000-25,000 mi. (13,000-40,000 km) into space, and bounded by the plasmapause. [1965-70; ...
plasmatic
See plasma. * * *
plasmic
See plasmatic. * * *
plasmid
/plaz"mid/, n. Microbiol. a segment of DNA independent of the chromosomes and capable of replication, occurring in bacteria and yeast: used in recombinant DNA procedures to ...
plasmin
/plaz"min/, n. Biochem. fibrinolysin (def. 1). [1865-70; PLASM- + -IN2] * * *
plasminogen
/plaz min"euh jeuhn, -jen'/, n. Biochem. the blood substance that when activated forms plasmin. [1940-45; PLASMIN + -O- + -GEN] * * *
plasmo-
a combining form representing plasma or cytoplasm in compound words: plasmolysis. Also, esp. before a vowel, plasm-. [comb. form, repr. Gk plásma. See PLASMA, -O-] * * *
plasmodesma
/plaz'meuh des"meuh/, n., pl. plasmodesmata /-meuh teuh/. Bot. any of many minute strands of cytoplasm that extend through plant cell walls and connect adjoining cells. [ < G ...
plasmodial
See plasmodium. * * *
plasmodiocarp
/plaz moh"dee euh kahrp'/, n. Mycol. a fruiting body of certain myxomycetes. [1875-80; PLASMODI(UM) + -O- + -CARP] * * *
Plasmodiophoromycota
▪ biology       phylum of plant parasites in the kingdom Chromista commonly referred to as endoparasitic slime molds. Some scientists assign Plasmodiophoromycota to the ...
plasmodium
—plasmodial, adj. /plaz moh"dee euhm/, n., pl. plasmodia /-dee euh/. 1. Biol. an ameboid, multinucleate mass or sheet of cytoplasm characteristic of some stages of organisms, ...
plasmogamy
/plaz mog"euh mee/, n. Biol. the fusion of the protoplasts of cells. Cf. karyogamy. [1910-15; PLASMO- + -GAMY] * * *
plasmolysis
—plasmolytic /plaz'meuh lit"ik/, adj. —plasmolytically, adv. /plaz mol"euh sis/, n. Bot. contraction of the protoplasm in a living cell when water is removed by ...
plasmolytic
See plasmolysis. * * *
plasmolytically
See plasmolytic. * * *
plasmolyze
plasmolyze [plaz′mō līz΄] vt., vi. plasmolyzed, plasmolyzing to subject to or undergo plasmolysis * * * plas·mo·lyze (plăzʹmə-līz') v. plas·mo·lyzed, ...
plasmon
plas·mon (plăzʹmŏn') n. The aggregate of cytoplasmic or extranuclear genetic material in an organism.   [German, from New Latin plasma, plasma. See plasma.] * * *
plasmosome
/plaz"meuh sohm'/, n. Cell Biol. a true nucleolus, as distinguished from a karyosome. [1885-90; PLASMO- + -SOME3] * * *
Plassey
/plah"see, plas"ee/, n. a village in NE India, about 80 miles (128 km) north of Calcutta: Clive's victory over a Bengal army here (1757) led to the establishment of British power ...
plaster
—plasterer, n. —plasteriness, n. —plasterlike, plastery, adj. /plas"teuhr, plah"steuhr/, n. 1. a composition, as of lime or gypsum, sand, water, and sometimes hair or other ...
plaster cast
any piece of sculpture reproduced in plaster of Paris. [1815-25] * * *
plaster of Paris
calcined gypsum in white, powdery form, used as a base for gypsum plasters, as an additive of lime plasters, and as a material for making fine and ornamental casts: characterized ...
plasterboard
/plas"teuhr bawrd', -bohrd', plah"steuhr-/, n. a material used for insulating or covering walls, or as a lath, consisting of paper-covered sheets of gypsum and felt. [1905-10; ...
plastercast
plaster cast n. 1. A sculptured mold or cast in plaster of Paris. 2. See cast. * * *
plastered
/plas"teuhrd, plah"steuhrd/, adj. Slang. drunk. [1910-15; PLASTER + -ED2] * * *
plasterer
See plaster. * * *
plastering
/plas"teuhr ing, plah"steuhr-/, n. 1. the process of working with plaster. 2. a coating of plaster. 3. a decisive defeat; drubbing. [1375-1425; late ME (ger.). See PLASTER, ...
plasterof Paris
plaster of Paris n. Any of a group of gypsum cements, essentially hemihydrated calcium sulfate, CaSO4· 1/2 H2O, a white powder that forms a paste when it is mixed with water and ...
plasterwork
/plas"teuhr werrk', plah"steuhr-/, n. Building Trades. finish or ornamental work done in plaster. [1590-1600; PLASTER + WORK] * * *
plastery
See plasterer. * * *
plastic
—plastically, plasticly, adv. /plas"tik/, n. 1. Often, plastics. any of a group of synthetic or natural organic materials that may be shaped when soft and then hardened, ...
Plastic and liquid limits of clay minerals
▪ Table Plastic and liquid limits of clay minerals (water content in percent) plastic limit liquid ...
plastic art
1. an art, as sculpture, in which forms are carved or modeled. 2. an art, as painting or sculpture, in which forms are rendered in or as if in three dimensions. [1630-40] * * *
plastic arts
plastic arts n. 1. arts producing works or effects that are three-dimensional, as sculpture or ceramics 2. arts producing works to be viewed, as sculpture, architecture, ...
plastic bomb
a bomb made of plastic explosive. [1950-55] * * *
plastic explosive
a puttylike substance that contains an explosive charge, and is detonated by fuse or by remote control: used esp. by terrorists and in guerrilla warfare. Also called ...
plastic flow
deformation of a material that remains rigid under stresses of less than a certain intensity but that behaves under severer stresses approximately as a Newtonian fluid. Also ...
plastic foam.
See expanded plastic. [1940-45] * * *
plastic memory
plastic memory n. the tendency of certain plastics after being deformed to resume their original form when heated * * *
plastic money
➡ credit cards * * *
plastic surgery
—plastic surgeon. the branch of surgery dealing with the repair or replacement of malformed, injured, or lost organs or tissues of the body, chiefly by the transplant of living ...
Plastic Wood
Trademark. a brand name for a compound used for patching and filling woodwork. * * *
plastic wrap
a very thin, transparent sheet of plastic, usually packaged in rolls and often having the ability to cling to other substances, used esp. to wrap and store food and for microwave ...
plastically
See plastic. * * *
plasticexplosive
plastic explosive n. A versatile explosive substance in the form of a moldable doughlike solid, used in bombs detonated by fuse or electrical impulse. Also called plastique. * * *
Plasticine
/plas"teuh seen'/, Trademark. a brand name for a synthetic material used as a substitute for clay or wax in modeling. * * *
plasticity
/pla stis"i tee/, n. 1. the quality or state of being plastic. 2. the capability of being molded, receiving shape, or being made to assume a desired form: the plasticity of ...
plasticization
See plasticize. * * *
plasticize
—plasticization, n. /plas"teuh suyz'/, v.t., v.i., plasticized, plasticizing. to render or become plastic. Also, esp. Brit., plasticise. [1925-30; PLASTIC + -IZE] * * *
plasticizer
/plas"teuh suy'zeuhr/, n. 1. any of a group of substances that are used in plastics or other materials to impart viscosity, flexibility, softness, or other properties to the ...
plastics
/plas"tiks/, adj. of or pertaining to a plastic or plastics: a plastics firm; plastics research. [1920-25; see PLASTIC, -ICS] * * * Polymers that can be molded or shaped, ...
plasticsurgeon
See plastic surgery. * * *
plasticsurgery
plastic surgery n. Surgery to remodel, repair, or restore body parts, especially by the transfer of tissue.   plastic surgeon n. * * *
plasticware
/plas"tik wair'/, n. knives, forks, spoons, cups, etc., made of plastic: a picnic hamper with plasticware for six. [PLASTIC + WARE1] * * *
plastid
/plas"tid/, n. Cell Biol. a small, double-membraned organelle of plant cells and certain protists, occurring in several varieties, as the chloroplast, and containing ribosomes, ...
plastidial
See plastid. * * *
plastique
/pla steek"/; Fr. /plann steek"/, n. 1. a ballet technique for mastering the art of slow, controlled movement and statuelike posing. 2. See plastic explosive. [1795-1805; < F: ...
plastiqueur
/plann stee kuerdd"/, n., pl. plastiqueurs /-kuerdd"/. French. a person, esp. a terrorist, who makes, places, or detonates plastic bombs. * * *
plastisol
/plas"teuh sawl', -sol'/, n. Chem. a dispersion of resin in a plasticizer, forming a liquid or paste that gels when heated. [1945-50; PLAST(IC)- + -I- + SOL4] * * *
plastogene
plastogene [plas′tə jēn΄] n. 〚< Gr plastos, formed (see -PLASTY) + E -gene, -GEN〛 a separate genetic particle associated with, and influencing the activity of, the ...
plastometer
—plastometric /plas'teuh me"trik/, adj. —plastometry, n. /pla stom"i teuhr/, n. an instrument for measuring the plasticity of a substance. [1915-20; PLAST(IC) + -O- + ...
plastoquinone
/plas'toh kweuh nohn", -kwin"ohn/, n. Biochem. a quinone that occurs in the chloroplasts of plants and functions as an electron carrier during photosynthesis. [1955-60; ...
plastotype
/plas"teuh tuyp'/, n. a casting of a type specimen, esp. of a fossil. [ < Gk plast(ós) molded (see -PLAST) + -O- + -TYPE] * * *
plastral
/plas"treuhl/, adj. Zool. of or pertaining to a plastron. [1885-90; PLASTR(ON) + -AL1] * * *
plastron
/plas"treuhn/, n. 1. a piece of plate armor for the upper part of the torso in front. 2. Fencing. a quilted pad worn over part of the torso, for protection. 3. an ornamental ...
Plaszow
▪ concentration camp, Poland Polish  Płaszów        Nazi (Nazi Party) German concentration camp near Kraków, in German-occupied Poland, used chiefly as a ...
plat
plat1 /plat/, n., v., platted, platting. n. 1. a plot of ground. 2. a plan or map, as of land. v.t. 3. to make a plat of; plot. [1400-50; late ME; var. of PLOT, reinforced by ME ...
plat du jour
/plah" deuh zhoor"/; Fr. /plann dyuu zhoohrdd"/, pl. plats du jour /plahz" deuh zhoor"/; Fr. /plann dyuu zhoohrdd"/. the special or featured dish of the day on a restaurant ...
plat-
var. of platy-. * * *
plat.
1. plateau. 2. platoon. * * *
Plata
/plah"tah/, n. Río de la /rddee"aw dhe lah/, an estuary on the SE coast of South America between Argentina and Uruguay, formed by the Uruguay and Paraná rivers, ab. 185 mi. ...
Plata, Río de la
Estuary of the Paraná and Uruguay rivers, between Uruguay and Argentina. It is about 170 mi (275 km) long, with a maximum width at its mouth of about 140 mi (220 km); at ...
Plata, Ríode la
Pla·ta (pläʹtə, -tä), Río de la A wide estuary of southeast South America between Argentina and Uruguay formed by the Paraná and Uruguay rivers and opening on the ...
Plataea
/pleuh tee"euh/, n. an ancient city in Greece, in Boeotia: Greeks defeated Persians here 479 B.C. * * * Ancient city, Boeotia, east-central Greece, south of Thebes. Plataea was ...
Plataea, Battle of
(479 BC) Battle between Greek and Persian forces near Plataea (modern Plataiaí) in Boeotia on the slopes of Mount Cithaeron. A largely Spartan force, including helots, defeated ...
platan
platan or platane [plat′'n] n. PLANE1 * * *
platband
/plat"band'/, n. Archit. 1. a flat structural member, as a lintel or flat arch. 2. any shallow molding having a flat face. [1690-1700; < MF platebande, equiv. to plate flat (see ...
plate
plate1 —plateless, adj. —platelike, adj. /playt/, n., v., plated, plating. n. 1. a shallow, usually circular dish, often of earthenware or porcelain, from which food is ...
plate armor
1. armor made of thin, flat, shaped pieces of wrought iron or steel. 2. any armor composed of, or having as an exterior surface, tough, stiff, flat pieces, large or small, of ...
plate block
Philately. a block of four or more stamps containing the number or numbers of the printing plate or plates in the margin of the sheet. * * *
plate girder
an iron or steel beam built up from plates and shapes welded or riveted together, usually including a plate or plates for a web, four angle irons forming two flanges, and a pair ...
plate glass
—plate-glass, plateglass, adj. a soda-lime-silica glass formed by rolling the hot glass into a plate that is subsequently ground and polished, used in large windows, mirrors, ...
plate mark
1. hallmark. 2. a mark made on paper by the edge of an intaglio plate during printing. [1855-60] * * *
plate proof
Print. proof taken from a plate ready for printing. * * *

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