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phase modulation in radio transmission, variation of the phase of a carrier wave in accordance with the amplitude of a modulating signal such as speech.
phase-out a gradual withdrawal or termination of operations, production, services, or the like.
Ph.D. abbreviation of "philosophiae doctor" (Latin); Doctor of Philosophy.
pheasant any of a number of fowls that have long tails and characteristically bright feathers in the male.
phellem a layer of dead cells that forms in the bark of woody plants; cork.
phellogen in woody plants, a tissue layer that lies just beneath the outer bark and generates the outer bark cells; cork cambium.
phenacetin acetophenetidin.
phenix variant of phoenix.
pheno- shining; showing. [2 definitions]
phenobarbital an odorless white crystalline powder that is used as a sedative, hypnotic, and antispasmodic.
phenocopy an environmentally produced change in an organism, similar to a mutation but nonhereditary.
phenocryst a large and usu. conspicuous crystal embedded in volcanic rock containing many such crystals.
phenol a poisonous white acidic compound found in the tars of wood and coal, or derived from benzene, and used primarily as a disinfectant or antiseptic. [2 definitions]
phenolphthalein a white or pale yellow crystalline powder that is used in making dyes and as an acid-base indicator and a laxative.
phenom (slang) an outstandingly talented person, esp. in sports or music.
phenomena a pl. of phenomenon.
phenomenal amazing or extraordinary. [3 definitions]
phenomenology the philosophical study of phenomena, esp. of subjective perceptual experience, as distinguished from ontology, the study of being.
phenomenon a perceptible occurrence or fact. [3 definitions]
phenothiazine a greenish organic compound used to expel intestinal worms in domestic animals, as an insecticide, and in the synthesis of tranquilizers.
phenotype the observable traits of an individual or group, esp. as a function of genetic composition and environment. (Cf. genotype.) [2 definitions]