apophysis

apophysis (noun; plural apophyses; Greek apo, away; phyein, to grow): 1. An internal or external tubercular or elongate process of the body wall; a prominence, swelling or expansion

See also: apodeme, apodome. 2. (Arthropoda: Insecta) see pleural apophysis, sternal apophyses. 3. (Mollusca) a. In Bivalvia, a large, styloid projection, one in each valve, extending from beneath the umbos to which the foot muscles are attached. b. In Polyplacophora, see sutural laminae.