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physis the area of growth at each end of the long bones of children and adolescents, also known as the epiphyseal plate or growth plate.
physostigmine a clear or pink crystalline substance obtained from the Calabar bean and used in various medicines, as for constricting the pupils in glaucoma.
-phyte a plant having the characteristic or growth habit specified. [2 definitions]
phyto- plant.
phytochemistry the branch of chemistry that deals with plants and the substances they produce.
phytogenic having developed or originated from plants, as coal.
phytoplankton tiny plant particles floating in bodies of water; algae. (Cf. zooplankton.)
P.I. abbreviation of "private investigator."
pi the name of the sixteenth letter of the Greek alphabet. [2 definitions]
piacular making amends; atoning. [2 definitions]
pia mater the innermost of three vascular membranes that envelop the brain and the spinal cord. (See arachnoid, dura mater.)
pianism the technique or performance of a pianist.
pianissimo in music, very soft. [3 definitions]
pianist one who plays the piano, esp. one who earns a living by doing so.
piano1 a large keyboard instrument with wire strings that are struck by small hammers attached to the ends of the keys.
piano2 in music, soft; quiet. [3 definitions]
pianoforte see piano1. [2 definitions]
piaster the smaller monetary unit of Egypt, Lebanon, Sudan, and Syria. (Cf. pound.) [2 definitions]
piazza a public square, usu. the main or only square, esp. in an Italian town or city. [2 definitions]
pibroch a composition for the bagpipe that consists of a dirgelike or martial theme with variations.
pica1 a printing type measuring about one sixth of an inch, or an equivalent linear measurement used to determine the dimensions of printed lines, illustrations, or the like. [2 definitions]