Preupsilon see sternal apophyses

prevalence n. [L. prae, before; valens, to be strong] The total number of cases of a particular disease at a particular time, in any given population. see incidence.

prevulvar setae (ARTHRO: Insecta) In Coccidae, large setae found anterior to the vulva on abdominal segments 6, 7, 8.

prezoea n. [L. prae, before; zoe, life] (ARTHRO: Crustacea) A newly-hatched postnaupliar larva covered by embryonic cuticle.

Priapulida, priapulids n.; n.pl. [Gr. Priapos, god of male fertility] A phylum of burrowing, vermiform marine animals with a variety of protuberances that are used in taxonomy.

primary n. [L. primus, first] First; original.

primary bud (BRYO) A hollow outward expansion of the body walls of the ancestrula.

primary circlet (ECHINOD: Asteroidea) A ring of prominent ossicles on the aboral surface.

primary culture A culture started from cells, tissues, or organs taken directly from organisms; if then subcultured, it becomes a 'cell line'.

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