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photosynthesis the process in plants by which sunlight, with the help of chlorophyll, is converted to chemical energy that is used to synthesize inorganic compounds into organic ones, esp. sugars.
photosynthesize to bring about or produce by the process of photosynthesis.
phototaxis the self-determined movement of an organism toward or away from light.
phototropic of, relating to, or influenced by phototropism.
phototropism the tendency of plants to turn or grow in a particular direction in response to light.
phototypesetting see photocomposition.
photovoltaic pertaining to, producing, or utilizing voltage that has been generated using radiant energy.
photovoltaic cell a cell that produces electromotive force when it is exposed to radiation, esp. light; solar cell.
phr. abbreviation of "phrase."
phrasal pertaining to or consisting of one or more phrases.
phrase in grammar, a string of words that has meaning and grammatical order but does not have both a subject and a predicate. [11 definitions]
phraseology characteristic manner or style of verbal expression. [2 definitions]
phrasing choice of words; wording. [2 definitions]
-phrenia a mental disorder.
phrenology the study of the configurations of the skull as an indication of a person's character and mental capabilities.
phthiriasis the condition of being infested with crab lice; pediculosis.
phthisis a wasting away of the body or a body part, such as tuberculosis of the lungs.
phycomycete any of several fungi that resemble algae, such as certain molds and mildews.
phyla pl. of phylum.
phylactery one of two small leather boxes worn strapped on the left arm and forehead by religious Jewish men during regular morning worship, that contain pieces of parchment bearing passages from Scripture. [2 definitions]
-phyll leaf.