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phlebotomus fever
/fleuh bot"euh meuhs/, Pathol. See sandfly fever. [1920-25; < NL Phlebotomus genus name of the sandfly < Gk phlebotómos vein-cutting (referring to instruments for letting ...
phlebotomusfever
phle·bot·o·mus fever (flĭ-bŏtʹə-məs) n. See sandfly fever.   [New Latin Phlebotomus, sand fly genus (from Late Latin phlebotomus, lancet, from Greek phlebotomos, ...
phlebotomy
/fleuh bot"euh mee/, n., pl. phlebotomies. Med. the act or practice of opening a vein for letting blood as a therapeutic measure; venesection; bleeding. [1350-1400; earlier ...
Phlegethon
—Phlegethontal, Phlegethontic, adj. /fleg"euh thon', flej"-/, n. 1. Also called Pyriphlegethon. Class. Myth. a river of fire, one of five rivers surrounding Hades. 2. (often ...
phlegm
—phlegmless, adj. /flem/, n. 1. the thick mucus secreted in the respiratory passages and discharged through the mouth, esp. that occurring in the lungs and throat passages, as ...
phlegmatic
—phlegmatically, adv. —phlegmaticalness, phlegmaticness, n. /fleg mat"ik/, adj. 1. not easily excited to action or display of emotion; apathetic; sluggish. 2. self-possessed, ...
phlegmatically
See phlegmatic. * * *
phlegmy
/flem"ee/, adj., phlegmier, phlegmiest. of, pertaining to, or characterized by phlegm. [1540-50; PHLEGM + -Y1] * * *
Phlm
Phlm abbrev. Bible Philemon * * *
Phlm.
Phlm. abbr. Bible Philemon. * * *
phloem
/floh"em/, n. the part of a vascular bundle consisting of sieve tubes, companion cells, parenchyma, and fibers and forming the food-conducting tissue of a plant. [ < G (1858), ...
phloem necrosis
Plant Pathol. a disease of the American elm caused by a mycoplasmalike organism, characterized by yellowing and necrosis of the foliage and yellowish-brown discoloration of the ...
phloem ray
Bot. a vascular ray extending into or located entirely within the secondary phloem. [1870-75] * * *
phlogistic
/floh jis"tik/, adj. 1. Pathol. inflammatory. 2. pertaining to or consisting of phlogiston. [1725-35; < Gk phlogist(ós) inflammable (verbid of phlogízein to set on fire; akin ...
phlogiston
/floh jis"ton, -teuhn/, n. a nonexistent chemical that, prior to the discovery of oxygen, was thought to be released during combustion. [1720-30; < NL: inflammability, n. use of ...
phlogopite
/flog"euh puyt'/, n. a magnesium-rich mica mineral, usually yellowish-brown, but sometimes reddish-brown. [1840-50; < Gk phlogop(ós) fiery-looking (phlog-, s. of phlóx flame + ...
phlorizin
/flawr"euh zin, flor"-, fleuh ruy"zin/, n. Chem. a bitter, crystalline glucoside, C21H24O10, obtained from the root bark of the apple, pear, cherry, etc.: formerly used as a ...
phloroglucinol
/flawr'euh glooh"seuh nawl', -nol', flor'-/, n. Chem. a white to yellow, crystalline, slightly water-soluble powder, C6H3(OH)3·2H2O, used chiefly in analytical chemistry and in ...
phlox
/floks/, n. 1. any plant of the genus Phlox, of North America, certain species of which are cultivated for their showy flowers of various colors. Cf. phlox family. 2. the flower ...
phlox family
the plant family Polemoniaceae, characterized by herbaceous or sometimes shrubby plants having simple or compound leaves, flowers with a five-lobed corolla, and capsular fruit, ...
phlyctena
/flik tee"neuh/, n., pl. phlyctenae /-nee/. Pathol. a small vesicle, blister, or pustule. Also, phlyctaena. [1685-95; < NL, var. of phlyctaena < Gk phlýktaina a blister, akin to ...
phlyctenar
See phlyctena. * * *
phlyctenule
phlyctenule [flik ten′yool] n. 〚ModL phlyctenula: see PHLYCTENA & -ULE〛 a small phlyctena phlyctenular adj. * * *
Phm
Phm abbrev. Bible Philemon * * * Phm abbr. Bible Philemon. * * *
Phnom Penh
/nom" pen", peuh nawm" pen"/ a city in and the capital of Cambodia, in the S part. 400,000. Also, Pnom Penh, Pnom-penh, Pnompenh. * * * City (pop., 1999 est.: 938,000), capital ...
PhnomPenh
Phnom Penh (pə-nômʹ pĕnʹ, nŏmʹ) The capital and largest city of Cambodia, in the southwest part of the country on the Mekong River. Founded in the 14th century, it ...
phobia
/foh"bee euh/, n. a persistent, irrational fear of a specific object, activity, or situation that leads to a compelling desire to avoid it. [1780-90; extracted from nouns ending ...
phobic
/foh"bik/, adj. 1. of or pertaining to a phobia or phobias. n. 2. a person suffering from a phobia. [1895-1900; PHOB(IA) + -IC, or by abstraction from adjectives ending in ...
Phobos
/foh"beuhs, -bos/, n. 1. Also, Phobus /foh"beuhs/. Class. Myth. a son and attendant of Ares and the personification of a fear held to possess armies and cause their defeat. 2. ...
Phocaea
/foh see"euh/, n. an ancient seaport in Asia Minor: northernmost of the Ionian cities; later an important maritime state. * * * Ancient city on the Aegean Sea, northernmost of ...
Phocas
▪ Byzantine emperor born 547 died Oct. 5, 610       centurion of modest origin, probably from Thrace, who became the late Roman, or Byzantine, emperor in ...
phocine
/foh"suyn, -sin/, adj. Zool. of or pertaining to seals. [1840-50; < L phoc(a) seal ( < Gk phóke) + -INE1] * * *
Phocion
/foh"shee euhn, -on'/, n. 402?-317 B.C., Athenian statesman and general. * * * ▪ Greek statesman born c. 402 BC died 318  Athenian statesman and general, virtual ruler of ...
Phocis
/foh"sis/, n. an ancient district in central Greece, N of the Gulf of Corinth: site of Delphic oracle. * * * Ancient territory, central Greece. It extended north from the Gulf ...
phocomelia
/foh'koh mee"lee euh, -meel"yeuh/, n. Pathol. a usually congenital deformity of the extremities in which the limbs are abnormally short. Also, phokomelia, phocomely /foh kom"euh ...
Phocus
▪ Greek mythology       in Greek mythology, the son of Aeacus, king of Aegina, and the Nereid Psamathe, who had assumed the likeness of a seal (Greek: phoce) in trying ...
phoebe
/fee"bee/, n. any of several small American flycatchers of the genus Sayornis, esp. S. phoebe, of eastern North America. [1690-1700, Amer.; imit.; sp. by influence of PHOEBE] * * ...
Phoebe
/fee"bee/, n. 1. Class. Myth. a Titan, daughter of Uranus and Gaea and mother of Leto, later identified with Artemis and with the Roman goddess Diana. 2. Astron. one of the moons ...
Phoebus
—Phoebean /fi bee"euhn, fee"bee-/, adj. /fee"beuhs/, n. 1. Class. Myth. Apollo as the sun god. 2. Literary. the sun personified. [ < L < Gk Phoîbos lit., bright, akin to ...
Phoenicia
/fi nish"euh, -nee"sheuh/, n. an ancient kingdom on the Mediterranean, in the region of modern Syria, Lebanon, and Israel. Also, Phenicia. See map under Tyre. * * * Ancient ...
Phoenician
/fi nish"euhn, -nee"sheuhn/, n. 1. a native or inhabitant of Phoenicia. 2. the extinct Semitic language of the Phoenicians. adj. 3. of or pertaining to Phoenicia, its people, or ...
Phoenician alphabet
      writing system that developed out of the North Semitic alphabet and was spread over the Mediterranean area by Phoenician traders. It is the probable ancestor of the ...
Phoenician language
      a Semitic language (Semitic languages) of the Northern Central (often called Northwestern) group, spoken in ancient times on the coast of Syria and Palestine in ...
phoenix
/fee"niks/, n., gen. Phoenicis /fee nuy"sis, -nee"-/ for 2. 1. (sometimes cap.) a mythical bird of great beauty fabled to live 500 or 600 years in the Arabian wilderness, to burn ...
Phoenix
/fee"niks/, n. 1. Class. Myth. a. the brother of Cadmus and Europa, and eponymous ancestor of the Phoenicians. b. a son of Amyntor and Cleobule who became the foster father of ...
Phoenix Islands
a group of eight coral islands in the central Pacific: part of Kiribati (formerly Gilbert Islands). 11 sq. mi. (28 sq. km). * * * Group of eight small coral atolls, ...
Phoenix Park murders
(May 6, 1882) Assassination in Dublin of British officials. The newly arrived chief secretary of Ireland, Lord Frederick Cavendish, and his undersecretary, Thomas Burke, were ...
Phoenix, River
▪ 1994       U.S. actor (b. Aug. 23, 1970, Madras, Ore.—d. Oct. 31, 1993, Los Angeles, Calif.), secured a reputation as a promising young star with his intense ...
PhoenixIslands
Phoenix Islands A group of eight small islands in the central Pacific Ocean north of Samoa. Discovered between 1823 and 1840 by British and American explorers, they were ...
Phoenixville
/fee"niks vil'/, n. a city in SE Pennsylvania. 14,165. * * * ▪ Pennsylvania, United States       borough (town), Chester county, southeastern Pennsylvania, U.S., on ...
phokomelia
/foh'koh mee"lee euh, -meel"yeuh/, n. Pathol. phocomelia. * * *
Pholidota
/fol'i doh"teuh/, n. the order comprising the pangolins. [ < NL < Gk pholidot(ós) clad in scales + NL -a neut. pl. ending] * * *
phon
/fon/, n. a unit for measuring the apparent loudness of a sound, equal in number for a given sound to the intensity in decibels of a sound having a frequency of 1000 cycles per ...
phon-
var. of phono- before a vowel: phonic. * * *
phon.
phonetics. * * *
phonasthenia
/foh'nas thee"nee euh/, n. Med. difficult or abnormal voice production; vocal weakness. [PHON- + ASTHENIA] * * *
phonate
/foh"nayt/, v.t., v.i., phonated, phonating. 1. Phonet. to provide (a sound source, and hence the pitch) for a given voiced continuant or vowel, through rapid, periodic glottal ...
phonathon
/foh"neuh thon'/, n. a campaign to solicit funds or support in which volunteers make phone calls to prospective donors or supporters. [PHONE1 + -ATHON] * * *
phonation
—phonatory /foh"neuh tawr'ee, -tohr'ee/, adj. /foh nay"sheuhn/, n. Phonet. 1. rapid, periodic opening and closing of the glottis through separation and apposition of the vocal ...
phone
phone1 /fohn/, n., v.t., v.i., phoned, phoning. telephone. [1880-85; by shortening] phone2 —phonal, adj. /fohn/, n. Phonet. a speech sound: There are three phonetically ...
phone book
☆ phone book n. Informal TELEPHONE BOOK * * *
phone book.
See telephone book. [1900-05] * * *
phone card
phone card n. see CALLING CARD (sense 3) * * *
phone card.
See calling card (def. 3). * * *
phone patch
phone patch n. see PATCH1 (n. 7) * * *
phone phreak
a person who uses computers or other electronic devices to place long-distance telephone calls without paying toll charges. Also called phreak. [1975-80] * * *
phone sex
sexually explicit conversations engaged in on a telephone, usually for a fee. * * *
phone tag.
See telephone tag. * * *
phone-in
/fohn"in'/, n., adj. call-in. [1965-70; n., adj. use of v. phrase phone in] * * *
phone-in programmes
➡ radio * * *
phonecard
phone card n. A prepaid card or a credit card that can be used to pay for telephone calls. Also called calling card. * * *
phonematic
/foh'neuh mat"ik/, adj. phonemic. [1935-40; < Gk phonemat- (s. of phónema) utterance + -IC] * * *
phonematics
/foh'neuh mat"iks/, n. (used with a sing. v.) Chiefly Brit. phonemics. [1935-40; see PHONEMATIC, -ICS] * * *
phoneme
/foh"neem/, n. Ling. any of a small set of units, usually about 20 to 60 in number, and different for each language, considered to be the basic distinctive units of speech sound ...
phonemic
—phonemically, adv. /feuh nee"mik, foh-/, adj. 1. of or pertaining to phonemes: a phonemic system. 2. of or pertaining to phonemics. 3. concerning or involving the ...
phonemically
See phonemic. * * *
phonemicist
See phonemics. * * *
phonemicize
—phonemicization, n. /feuh nee"meuh suyz', foh-/, v.t., phonemicized, phonemicizing. 1. to transcribe into phonemic symbols. 2. to analyze (a word, the sound structure of a ...
phonemics
—phonemicist /feuh nee"meuh sist, foh-/, n. /feuh nee"miks, foh-/, n. (used with a sing. v.) 1. the study of phonemes and phonemic systems. 2. the phonemic system of a ...
phonesex
phone sex n. Sexually explicit talk engaged in by telephone, especially to enhance autoerotic pleasure. * * *
phonesthemic
/foh'neuhs thee"mik/, adj. Ling. (of a speech sound) shared by a set of echoic or symbolic words, as the sn- of sneer, snarl, snatch, snide, snitch, snoop, etc. [phonestheme such ...
phonet.
phonetics. * * *
phonetic
—phonetically, adv. /feuh net"ik, foh-/, adj. 1. Also, phonetical. of or pertaining to speech sounds, their production, or their transcription in written symbols. 2. ...
phonetic alphabet
an alphabet containing a separate character for each distinguishable speech sound. [1860-65] * * *
phonetic law
Historical Ling. a statement of some regular pattern of sound change in a specific language, as Grimm's law or Verner's law. * * *
phonetical
See phonetic. * * *
phonetically
See phonetical. * * *
phoneticalphabet
phonetic alphabet n. 1. A standardized set of symbols used in phonetic transcription. 2. Any of various systems of code words for identifying letters in voice communication. * * *
phonetician
/foh'ni tish"euhn/, n. 1. a specialist in phonetics or in some aspect of phonetics. 2. a dialectologist. [1840-50; PHONETIC + -IAN] * * *
phoneticize
—phoneticization, n. /feuh net"euh suyz', foh-/, v.t., phoneticized, phoneticizing. 1. to represent (speech) in writing by means of a system in which individual symbols ...
phonetics
/feuh net"iks, foh-/, n. (used with a sing. v.) 1. the science or study of speech sounds and their production, transmission, and reception, and their analysis, classification, ...
phonetist
/foh"ni tist/, n. a person who uses or advocates phonetic spelling. [1860-65; < Gk phonet(ós) (see PHONETIC) + -IST] * * *
Phonevision
/fohn"vizh'euhn/, Trademark. a brand name for a system of transmitting television signals over telephone lines so that callers can see each other on small television receivers. * ...
phoney
—phoneyness, n. /foh"nee/, adj., phonier, phoniest, n., pl. phoneys, v.t., phoneyed, phoneying. phony. * * *
phoney war
➡ phony war * * *
phoniatrics
—phoniatric, adj. /foh'nee a"triks/, n. (used with a sing. v.) Speech Pathol. the study and treatment of voice disorders. Also, phoniatry /foh nuy"euh tree/. [1945-50; PHON- + ...
phonic
—phonically, adv. /fon"ik, foh"nik/, adj. of or pertaining to speech sounds. [1815-25; PHON- + -IC] * * *
phonically
See phonic. * * *
phonics
/fon"iks/ or, for 2, /foh"niks/, n. (used with a sing. v.) 1. a method of teaching reading and spelling based upon the phonetic interpretation of ordinary spelling. 2. Obs. ...
phonily
See phony. * * *
phoniness
See phonily. * * *
phono
/foh"noh/, n., pl. phonos. Informal. phonograph. [by shortening] * * *
phono-
a combining form meaning "sound," "voice," used in the formation of compound words: phonology. Also, esp. before a vowel, phon-. Cf. -phone, -phony. [1945-50; < Gk, comb. form ...
phonocardiogram
/foh'neuh kahr"dee euh gram'/, n. Med. the graphic record produced by a phonocardiograph. [1910-15; PHONO- + CARDIOGRAM] * * *
phonocardiograph
—phonocardiography /foh'neuh kahr'dee og"reuh fee/, n. /foh'neuh kahr"dee euh graf', -grahf'/, n. Med. an instrument for graphically recording the sound of the ...
phonocardiographic
See phonocardiograph. * * *
phonocardiography
See phonocardiographic. * * * ▪ medicine       diagnostic technique that creates a graphic record, or phonocardiogram, of the sounds and murmurs produced by the ...
Phonofilm
▪ film       system used in the 1920s to provide sound synchronized with motion pictures. A sound track was photographically recorded on the film by a beam of light ...
phonogram
—phonogramic, phonogrammic, adj. —phonogramically, phonogrammically, adv. /foh"neuh gram'/, n. a unit symbol of a phonetic writing system, standing for a speech sound, ...
phonogramic
See phonogram. * * *
phonogramically
See phonogramic. * * *
phonogrammic
See phonogramic. * * *
phonogrammically
See phonogramic. * * *
phonograph
/foh"neuh graf', -grahf'/, n. any sound-reproducing machine using records in the form of cylinders or discs. [1825-35 in sense "phonogram"; 1877 for the "talking phonograph" ...
phonographer
See phonography. * * *
phonographic
—phonographically, adv. /foh'neuh graf"ik/, adj. 1. of, pertaining to, or characteristic of a phonograph. 2. of, pertaining to, or noting phonography. Also, ...
phonographically
See phonographic. * * *
phonographist
See phonographer. * * *
phonography
—phonographer, phonographist, n. /foh nog"reuh fee/, n., pl. phonographies for 2. 1. phonetic spelling, writing, or shorthand. 2. a system of phonetic shorthand, as that ...
phonol.
phonology. * * *
phonolite
—phonolitic /fohn'l it"ik/, adj. /fohn"l uyt'/, n. a fine-grained volcanic rock composed chiefly of alkali feldspar and nepheline, some varieties of which split into pieces ...
phonolitic
See phonolite. * * *
phonologic
See phonology. * * *
phonological
See phonologic. * * *
phonological rule
Ling. an operation in generative phonology that substitutes one sound or class of sounds for another in a phonological derivation. * * *
phonologically
See phonologic. * * *
phonologist
/feuh nol"euh jist, foh-/, n. a specialist in phonology. [1840-50; PHONOLOG(Y) + -IST] * * *
phonology
—phonological /fohn'l oj"i keuhl/, phonologic, adj. —phonologically, adv. /feuh nol"euh jee, foh-/, n., pl. phonologies. 1. the study of the distribution and patterning of ...
phonometer
—phonometric /foh'neuh me"trik/, adj. —phonometry, n. /feuh nom"i teuhr, foh-/, n. a device for measuring the intensity of a sound. [1815-25; PHONO- + -METER] * * *
phonon
/foh"non/, n. Physics. a quantum of sound or vibratory elastic energy, being the analogue of a photon of electromagnetic energy. [1930-35; PHON- + -ON1] * * * In solid-state ...
phonoreception
/foh'noh ri sep"sheuhn/, n. the physiological perception of sound. [PHONO- + RECEPTION] * * *
phonoreceptor
/foh'noh ri sep"teuhr/, n. Physiol., Biol. a receptor stimulated by sound waves. [PHONO- + RECEPTOR] * * *
phonoscope
/foh"neuh skohp'/, n. 1. an instrument for making visible the motions or properties of a sounding body. 2. a device for testing the quality of strings for musical ...
phonotactic
/foh'neuh tak"tik/, adj. Ling. of or pertaining to phonotactics: Phonotactic constraints in English prevent the occurrence of the consonant clusters (sr) and (dl) at the ...
phonotactics
/foh'neuh tak"tiks/, n. (used with a sing. v.) Ling. 1. the patterns in which the phonemes of a language may combine to form sequences. 2. the study and description of such ...
phonotype
—phonotypic /foh'neuh tip"ik/, phonotypical, adj. —phonotypically, adv. /foh"neuh tuyp'/, n. Print. a piece of type bearing a phonetic character or symbol. [1835-45; PHONO- + ...
phonotypic
See phonotype. * * *
phonotypical
See phonotypic. * * *
phonotypically
See phonotypic. * * *
phonotypist
See phonotypy. * * *
phonotypy
—phonotypist, phonotyper, n. /foh"neuh tuy'pee/, n., pl. phonotypies. phonography (def. 2). [1875-80; PHONOTYPE + -Y3] * * *
phony
—phonily, adv. —phoniness, n. /foh"nee/, adj., phonier, phoniest, n., pl. phonies, v., phonied, phonying. adj. 1. not real or genuine; fake; counterfeit: a phony diamond. 2. ...
phony disease
Plant Pathol. a disease of peaches, characterized by dwarfing, dark-green leaves, premature leafing and flowering, and the production of reduced numbers of small fruit, caused by ...
phony war
(also phoney war) n a situation in which two or more countries have officially declared war but have not yet started to fight. The best-known phony war was the first six months ...
phony-baloney
/foh"nee beuh loh"nee/, Slang. n. 1. nonsense; baloney. adj. 2. nonsensical; foolish. * * *
phooey
/fooh"ee/, interj. Informal. (an exclamation indicating rejection, contempt, or disgust): Phooey on all those political promises! [1925-30, Amer.; perh. < G pfui! expression of ...
phorate
/fawr"ayt, fohr"-/, n. Chem. a systemic insecticide, C7H17O2PS3, used esp. as a soil treatment for the control of numerous crop-damaging insects. [1955-60; prob. by shortening of ...
phorbol
/fawr"bawl, -bol/, n. Biochem. the parent alcohol, C20H28O6, of certain carcinogenic compounds in croton oil. [ < G Phorbol (1927) < Gk phorb(é) forage (see FORB) + G -ol ...
Phorcys
/fawr"sis/, n. Class. Myth. a sea god who fathered the Gorgons. * * *
phoresy
/fawr"euh see/, n. Zool. (among insects and arachnids) a nonparasitic relationship in which one species is carried about by another. [1920-25; < NL phoresia < Gk phóres(is) a ...
Phormion
▪ Greek admiral died c. 428 BC       brilliant Athenian admiral who won several engagements before and during the Peloponnesian War.       Phormion was one of ...
phormium
▪ plant and fibre Portuguese  formio,         (species Phormium tenax), a plant of the day lily family, Hemerocallidaceae, and its fibre, belonging to the leaf fibre ...
phoronid
/feuh roh"nid/, n. 1. any member of the invertebrate phylum Phoronida, wormlike marine animals living in a chitinous tube and having an anterior structure bearing ciliated ...
phos-
phos- pref. Light: phosgene.   [From Greek phōs, light. See bhā-1. * * *
phosgene
/fos"jeen, foz"-/, n. Chem. a poisonous, colorless, very volatile liquid or suffocating gas, COCl2, a chemical-warfare compound: used chiefly in organic synthesis. Also called ...
phosgenite
/fos"jeuh nuyt', foz"-/, n. a mineral, lead chlorocarbonate, Pb2Cl2CO3, occurring in crystals. [1840-50; < G Phosgenit. See PHOSGENE, -ITE1] * * *
phosph-
var. of phospho- before a vowel: phosphate. * * *
phosphagen
/fos"feuh jeuhn, -jen'/, n. Biochem. a high-energy phosphoric ester that serves as a reservoir of phosphate-bond energy, as phosphocreatine in vertebrates and phosphoarginine in ...
phosphamidon
/fos fam"i don'/, n. Chem. a systemic and contact insecticide, C10H19ClNO5P, used against beetles, aphids, mites, and other crop pests. [1955-60; perh. PHOSPH(ATE) + AMIDE + ...
phosphatase
/fos"feuh tays', -tayz'/, n. Biochem. any of several classes of esterases of varying specificity that catalyze the hydrolysis of phosphoric esters. [1910-15; PHOSPHATE + -ASE] * ...
phosphate
/fos"fayt/, n. 1. Chem. a. (loosely) a salt or ester of phosphoric acid. b. a tertiary salt of orthophosphoric acid, as sodium phosphate. 2. Agric. a fertilizing material ...
phosphate group
Chem. the group or radical obtained by removal of one or more hydrogen atoms from phosphoric acid. [1950-55] * * *
phosphate mineral
      any of a group of naturally occurring inorganic salts of phosphoric acid, H3(PO4). More than 200 species of phosphate minerals are recognized, and structurally they ...
Phosphate minerals
▪ Table Phosphate minerals name colour lustre Mohs' hardness specific gravity amblygonite white to creamy white; slightly tinted vitreous to ...
phosphate rock
phosphorite. [1865-70] * * * ▪ Table Phosphate rock country mine production 2006 (metric tons)* % of world mine production demonstrated reserves 2006 (metric tons)* % of ...
phosphaterock
phosphate rock n. Any of various rocks composed largely of phosphate minerals, especially apatite, used as fertilizer and as a source of phosphorous compounds. * * *
phosphatic
/fos fat"ik, -fay"tik/, adj. of, pertaining to, or containing phosphates: phosphatic slag. [1820-30; PHOSPHATE + -IC] * * *
phosphatide
/fos"feuh tuyd', -tid/, n. Biochem. phospholipid. [1884; PHOSPHATE + -IDE] * * *
phosphatidic
See phosphatide. * * *
phosphatidylcholine
phos·pha·ti·dyl·cho·line (fŏs'fə-tīd'l-kōʹlēn') n. See lecithin.   [phosphate + -ide + -yl + choline.] * * *
phosphatization
See phosphatize. * * *
phosphatize
—phosphatization, phosphation /fos fay"sheuhn/, n. /fos"feuh tuyz'/, v.t., phosphatized, phosphatizing. 1. to treat with phosphates. 2. to change to phosphate. Also, esp. ...
phosphaturia
—phosphaturic, adj. /fos'feuh toor"ee euh, -tyoor"-/, n. Pathol. the presence of an excessive quantity of phosphates in the urine. [1875-80; PHOSPHATE + -URIA] * * *
phosphaturic
See phosphaturia. * * *
phosphene
/fos"feen/, n. Physiol. a luminous image produced by mechanical stimulation of the retina, as by pressure applied to the eyeball by the finger when the lid is closed. [1870-75; < ...
phosphide
/fos"fuyd, -fid/, n. Chem. a binary compound of phosphorus with a basic element or group. [1840-50; PHOSPH- + -IDE] * * * ▪ chemical compound       any of a class of ...
phosphine
/fos"feen, -fin/, n. Chem. 1. a colorless, poisonous, ill-smelling, flammable gas, PH3. 2. any of certain organic derivatives of this compound. [1870-75; PHOSPH- + -INE1] * * ...
phosphite
/fos"fuyt/, n. Chem. (loosely) a salt of phosphorous acid. [1790-1800; PHOSPH- + -ITE1] * * *
phospho-
a combining form representing phosphorus in compound words: phosphoprotein. Also, esp. before a vowel, phosph-. Cf. phosphoro-. * * *
phosphocreatine
/fos'foh kree"euh teen', -tin/, n. Biochem. a compound, C4H10O5N3P, found chiefly in muscle, formed by the enzymatic interaction of an organic phosphate and creatine, the ...
phosphodiesterase
phos·pho·di·es·ter·ase (fŏs'fō-dī-ĕsʹtə-rās', -rāz') n. Any of a class of enzymes that catalyze the cleaving of phosphodiester bonds, such as those between ...
phosphodiesterbond
phos·pho·di·es·ter bond (fŏs'fō-dī-ĕsʹtər) n. The covalent chemical bond that holds together the polynucleotide chains of RNA and DNA by joining a carbon in the ...
phosphofructokinase
phos·pho·fruc·to·ki·nase (fŏs'fō-frŭk'tō-kīʹnās, -fro͝ok'-) n. A glycolytic enzyme that catalyzes the phosphorylation of fructose phosphate.   [phospho- + fructose ...
phospholipase
/fos'foh luy"pays, -payz/, n. Biochem. any of a group of enzymes that catalyze the breaking down of phospholipids. [ < G (1935); see PHOSPHOLIPID, -ASE] * * *
phospholipid
/fos'foh lip"id/, n. Biochem. any of a group of fatty compounds, as lecithin, composed of phosphoric esters, and occurring in living cells. Also called phosphatide, phospholipide ...
phospholipid bilayer
a two-layered arrangement of phosphate and lipid molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward. ...
phosphonium
/fos foh"nee euhm/, n. Chem. the positively charged group PH4+. [1865-70; PHOSPH(ORUS) + (AMM)ONIUM] * * *
phosphonium iodide
Chem. a colorless to slightly yellowish, crystalline, water-soluble solid, PH4I, used in chemical synthesis. [1870-75] * * *
phosphoprotein
/fos'foh proh"teen, -tee in/, n. Biochem. a protein, as casein or ovalbumin, in which one or more hydroxyl groups of serine, threonine, or tyrosine are hydroxylated. [1905-10; ...
phosphor
/fos"feuhr, -fawr/, n. 1. any of a number of substances that exhibit luminescence when struck by light of certain wavelengths, as by ultraviolet. 2. Literary. a phosphorescent ...
Phosphor
/fos"feuhr, -fawr/, n. the morning star, esp. Venus. Also, Phosphore /fos"fawr, -fohr/, Phosphorus. [1625-35; < L Phosphorus < Gk Phosphóros the morning star, lit., the ...
phosphor bronze
a bronze, composed of about 80 percent copper, 10 percent tin, 9 percent antimony, and 1 percent phosphorus, having great hardness and resistance to corrosion. [1870-75] * * ...
phosphor-
var. of phosphoro- before a vowel: phosphorate. * * *
phosphorate
/fos"feuh rayt'/, v.t., phosphorated, phosphorating. 1. Also, phosphorize. Chem. to combine or impregnate with phosphorus. 2. to cause to have phosphorescence. [1780-90; ...
phosphorbronze
phosphor bronze n. A hard, strong, corrosion-resistant bronze containing tin and a small amount of phosphorus, used in machine parts, springs, and fine tubing. * * *
phosphoresce
/fos'feuh res"/, v.i., phosphoresced, phosphorescing. to be luminous without sensible heat, as phosphorus. [1785-95; PHOSPHOR(US) + -ESCE] * * *
phosphorescence
/fos'feuh res"euhns/, n. 1. the property of being luminous at temperatures below incandescence, as from slow oxidation in the case of phosphorus or after exposure to light or ...
phosphorescent
—phosphorescently, adv. /fos'feuh res"euhnt/, adj. exhibiting phosphorescence. [1760-70; PHOSPHOR(US) + -ESCENT] * * *
phosphorescently
See phosphorescent. * * *
phosphoreted
/fos"feuh ret'id/, adj. Chem. phosphureted. Also, phosphoretted. * * *
phosphoric
/fos fawr"ik, -for"-/, adj. Chem. of or containing phosphorus, esp. in the pentavalent state. [1775-85; PHOSPHOR- + -IC] * * *
phosphoric acid
Chem. any of three acids, orthophosphoric acid, H3PO4, metaphosphoric acid, HPO3, or pyrophosphoric acid, H4P2O7, derived from phosphorus pentoxide, P2O5, and various amounts of ...
phosphoric anhydride
Chem. See phosphorus pentoxide. [1875-80] * * *
phosphoricacid
phosphoric acid n. A clear colorless liquid, H3PO4, used in fertilizers, detergents, food flavoring, and pharmaceuticals. * * *
phosphorism
/fos"feuh riz'euhm/, n. Pathol. chronic phosphorus poisoning. [1780-90; PHOSPHOR- + -ISM] * * *
phosphorite
—phosphoritic /fos'feuh rit"ik/, adj. /fos"feuh ruyt'/, n. a sedimentary rock sufficiently rich in phosphate minerals to be used as a source of phosphorus for ...
phosphorize
—phosphorization, n. /fos"feuh ruyz'/, v.t., phosphorized, phosphorizing. phosphorate (def. 1). Also, esp. Brit., phosphorise. [1790-1800; PHOSPHOR- + -IZE] * * *
phosphoro-
a combining form representing phosphorus in compound words: phosphoroscope. Also, esp. before a vowel, phosphor-. Cf. phospho-. * * *
phosphoroscope
/fos fawr"euh skohp', -for"-/, n. an instrument for measuring the duration of evanescent phosphorescence in different substances. [1855-60; PHOSPHORO- + -SCOPE] * * *
phosphorous
/fos"feuhr euhs, fos fawr"euhs, -fohr"-/, adj. Chem. containing trivalent phosphorus. [1770-80; PHOSPHOR- + -OUS] * * *
phosphorous acid
Chem. a colorless, crystalline, water-soluble acid of phosphorus, H3PO3, from which phosphites are derived. [1785-95] * * * ▪ chemical compound (H3PO3),also called ...
phosphorousacid
phosphorous acid n. A white or yellowish hygroscopic crystalline solid, H3PO3, used as a reducing agent and to produce phosphite salts. * * *
phosphorus
/fos"feuhr euhs/, n., pl. phosphori /-feuh ruy'/. 1. Chem. a solid, nonmetallic element existing in at least three allotropic forms, one that is yellow, poisonous, flammable, and ...
Phosphorus
/fos"feuhr euhs/, n. Phosphor. * * * Nonmetallic chemical element, chemical symbol P, atomic number 15. The ordinary allotrope, called white phosphorus, is a poisonous, ...
phosphorus 32
Chem. a radioactive isotope of phosphorus, used as a chemotherapeutic agent. Also called radiophosphorus. * * *
phosphorus cycle
      circulation of phosphorus in various forms through nature. Of all the elements recycled in the biosphere, phosphorus is the scarcest and therefore the one most ...
phosphorus deficiency
▪ medical disorder       condition in which phosphorus is insufficient or is not utilized properly. Phosphorus is a mineral that is vitally important to the normal ...
phosphorus pentoxide
/pen tok"suyd, -sid/, Chem. a white, deliquescent, crystalline powder, P2O5, that, depending upon the amount of water it absorbs, forms orthophosphoric acid, metaphosphoric acid, ...
phosphorus sesquisulfide
/ses'kwi sul"fuyd/ (not in scientific use) a yellow, crystalline, flammable substance, P4S3, insoluble in cold water and decomposed by hot water: used chiefly in organic ...
phosphorus trichloride
Chem. a clear, colorless, fuming liquid, PCl3, used chiefly in organic synthesis as a chlorinating agent. * * *
phosphoryl group
/fos"feuh ril/, Chem. the trivalent group _=P_=O. Also called phosphoryl radical. [PHOSPHOR- + -YL] * * *
phosphorylase
/fos"feuhr euh lays', -layz', fos fawr"euh-, -for"-/, n. Biochem. any enzyme, occurring widely in animal and plant tissue, that in the presence of an inorganic phosphate ...
phosphorylate
—phosphorylation, n. /fos"feuhr euh layt', fos fawr"euh-, -for"-/, v.t., phosphorylated, phosphorylating. Chem. to introduce the phosphoryl group into (an organic ...
phosphorylation
See phosphorylate. * * * ▪ chemical reaction       in chemistry, the addition of a phosphoryl group (PO32-) to an organic compound. The process by which much of the ...
phosphorylative
See phosphorylation. * * *
phosphureted
/fos"fyeuh ret'id/, adj. Chem. combined with phosphorus, esp. in its lowest valence state. Also, phosphoreted, phosphoretted, phosphuretted. [phosphuret phosphide (see PHOSPH-, ...
Phosvel
/fos"vel/, Chem., Trademark. a brand of leptophos. * * *
phot
/fot, foht/, n. Optics. a unit of illumination, equal to 1 lumen per square centimeter. Abbr.: ph [1915-20; < Gk phot-, s. of phôs (contr. of pháos) light] * * *
phot-
var. of photo- before a vowel: photalgia. * * *
phot.
1. photograph. 2. photographer. 3. photographic. 4. photography. * * *
photalgia
/foh tal"jeuh, -jee euh/, n. Pathol. pain, as in an eye, that is caused by intensity of light. [PHOT- + -ALGIA] * * *
Photian Schism
▪ Christianity       a 9th-century-AD controversy between Eastern and Western Christianity that was precipitated by the opposition of the Roman pope to the appointment ...
photic
/foh"tik/, adj. 1. of or pertaining to light. 2. pertaining to the generation of light by organisms, or their excitation by means of light. [1835-45; < Gk phot- (see PHOT) + ...
photic zone
Biol. the upper layer of a body of water delineated by the depth to which enough sunlight can penetrate to permit photosynthesis. [1970-75] * * * ▪ ...
photics
/foh"tiks/, n. (used with a sing. v.) the science of light. [1855-60; see PHOTIC, -ICS] * * *
photinia
/foh tin"ee euh/, n. any of various trees or shrubs belonging to the genus Photinia, of the rose family, having clusters of small white flowers and red, berrylike fruit. [ < NL ...
Photisarath
▪ king of Lan Xang also spelled Phothisarath, Phothisarat, or Potisarat born 1501 died 1547       ruler (1520–47) of the Lao kingdom of Lan Xang whose territorial ...
photism
/foh"tiz euhm/, n. Psychol. a form of synesthesia in which a visual sensation, as of color or form, is produced by the sense of touch, hearing, etc. [1890-95; < Gk photismós ...
Photius
/foh"shee euhs/, n. A.D. c820-891, patriarch of Constantinople 858-867, 877-882. * * *
Photius, Saint
born с 820, Constantinople died 10th century; feast day February 6 Patriarch of Constantinople (858–867, 877–886). A high-ranking civil servant, he was promoted swiftly ...
photo
/foh"toh/, n., pl. photos. 1. photograph. 2. Informal. See photo finish. [1855-60; shortened form of PHOTOGRAPH] * * *
photo essay
—photo essayist. a group of photographs, usually with supplementary text, that conveys a unified story and is published as a book or as a feature in a magazine or newspaper. ...
photo finish
—photo-finish, adj. Sports. a finish of a race in which two or more contestants are so close to the finish line that reference to a photograph of the finish is necessary to ...
photo layout
a picture spread. See under spread (def. 34). * * *
Photo League
▪ American organization       organization of New York City photographers devoted to documenting life in the city's working-class neighbourhoods.       The Photo ...
photo opportunity
a brief period set aside for the media to take photographs of a high government official or celebrity, usually immediately before or after a newsworthy event. [1975-80] * * *
photo spread
a picture spread. See under spread (def. 34). * * *
photo story.
See photo essay. Also photostory. [1935-40] * * *
photo-
a combining form meaning "light" (photobiology); also used to represent "photographic" or "photograph" in the formation of compound words: photocopy. Also, esp. before a vowel, ...
photo-essay
pho·to-es·say also pho·to es·say (fōʹtō-ĕs'ā') n. A series of photographs that conveys a story, usually accompanied by a written text and published as a book or special ...
photo-essayist
See photo-essay. * * *
photo-ionization
▪ physics       the interaction of electromagnetic radiation with matter resulting in the dissociation of that matter into electrically charged particles. The simplest ...
photo-mount
/foh"toh mownt'/, n. a heavy paper or board suitable for mounting photographs. * * *
photo-offset
/foh'toh awf"set', -of"-/, n., v., photo-offset, photo-offsetting. n. 1. a method of printing, based on photolithography, in which the inked image is transferred from the metal ...
photo-realism
pho·to-re·al·ism (fō'tō-rēʹə-lĭz'əm) n. A style of painting that resembles photography in its meticulous attention to realistic detail.   pho'to-reʹal·ist adj. & ...
photo-realist
See photo-realism. * * *
Photo-Secession
—Photo-Secessionist, n. /foh'toh si sesh"euhn/, n. an association of photographers founded in New York City in 1902 by Alfred Stieglitz and Edward Steichen that advocated the ...
photoacoustic
photoacoustic [fō΄tō ə ko͞os′tik] adj. OPTOACOUSTIC * * *
photoactinic
/foh'toh ak tin"ik/, adj. emitting radiation having the chemical effects of light and ultraviolet rays, as on a photographic film. [PHOTO- + ACTINIC] * * *
photoactivation
—photoactive, adj. —photoactivity, n. /foh'toh ak'teuh vay"sheuhn/, n. Chem. the activation or control of a chemical, chemical reaction, or organism by light, as the ...
photoactive
pho·to·ac·tive (fō'tō-ăkʹtĭv) adj. 1. Capable of responding to light photoelectrically. 2. Capable of responding to sunlight or ultraviolet radiation by chemical ...
photoactivity
See photoactive. * * *
photoaging
/foh'toh ay"jing/, n. damage to the skin, as wrinkles or discoloration, caused by prolonged exposure to sunlight. [1985-90] * * *
photoallergic
/foh'toh euh lerr"jik/, adj. photosensitive. Cf. photosensitivity. [1935-40; PHOTO- + ALLERGIC] * * *


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