pilose a. [L. pilus, hair] Hairy; with fine, soft hair.
pilus n.; pl. pili [L. pilus, hair] A hair or hair-like structure.
pinacocyte n. [Gr. pinax, tablet; kytos, container] (PORIF) The large flat polygonal cells that line all surfaces, except those of the choanocyte chambers. see exopinacocyte, endopinacocyte, basopinacocyte.
pinacoderm, pinnacoderm n. [Gr. pinax, tablet; derma, skin] (PORIF) The outer delimiting membrane layers of pinaco-cytes; ectosome.
pinaculum n. [Gr. pinax, tablet] (ARTHRO: Insecta) Small, flat or slightly raised chitinized area with one to four setae.
pincers n.pl. [OF. pincier, to pinch] Any structure that resembles the grasping end of pincers.
pinna n.; pl. pinnae [L. feather] 1. A wing or fin. 2. (ARTHRO: Insecta) The part of the trumpet of Culicidae pupae from the apex to an imaginary line drawn approximately perpendicular to the longitudinal axis at the proximal margin of the spiracular opening.
pinnafid n. [L. pinna, feather; findare, to split] (ARTHRO: Insecta) Wings that are deeply divided, as in Thysanoptera.
pinnate a. [L. pinnatus, feathered] 1. Feather or fern-like in appearance. 2. Having hairs, thorny or lateral processes on opposite sides.
pinnules n.pl. [L. dim. pinna, feather] 1. (ANN: Polychaeta) The lessened lateral paddle-like parapodia. 2. (echinod: Crinoidea) Short tapering, flexible lateral projections or branches on either side of the arms.
pinocytosis n. [Gr. pino, drink; kytos, container] Ingestion or absorption of surrounding fluids by a cell, that forms a vesicle by incupping of the surface membrane.
pinosome n. [Gr. pino, drink; soma, body] Intracellular vesicle containing material taken up by pinocytosis.
pinule, pinulus n. [L. dim. pinna, feather] (PORIF) A spicule resembling a fir tree because of small spines developing on one ray, usually 5 rayed spicules.
pioneer community Organisms that establish a new community on bare ground.
piping n. [L. pipare, to chirp] (ARTHRO: Insecta) In Apis, sound made by young queens after their emergence.
piptoblast n. [Gr. piptein, to fall; blastos, bud] (bryo) An encapsulated bud not released from parent colony.
piriform a. [L. pirum, pear; forma, shape] Pear-shaped; pyri-form.
piscicolous a. [L. piscis, fish; colere, to inhabit] Living in fish.
pisciform n. [L. piscis, fish; forma, shape] Fish-shaped.
pisiform a. [L. pisum, a pea; forma, shape] Pertaining to pea-shaped; a small globular body.
pit gland (ROTIF: Monogononta) A secretion gland in the form of a cuplike pit on the corona.
pith n. [A.S. pitha, marrow, pith] (PORIF) A central region of more diffuse collagen found within a spongin fiber.
pivotal axis (MOLL: Bivalvia) An axis at the ligament about which the valves rotate.
pivotal bar (bryo) In Cheilostomata avicularia, a complete skeletal rim on which the fixed end of the mandible is hinged.
placids n.pl. [Gr. plax, plate] (kinor) Large plates located on the 3rd zonite (neck) with retractable necks; nonre-tractable are located on the 2nd zonite and sometimes referred to as a closing apparatus.
placoid a. [Gr. plax, plate] Plate-like.
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