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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]
pica2 an abnormal craving for unnatural foods such clay or dirt.
picador the mounted lancer in a bullfight.
picaresque of, relating to, or like an episodic adventure story, of a type originating in Spain, about a rogue and his escapades. [2 definitions]