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The Collaborative International Dictionary

Epistoma \E*pis"to*ma\, Epistome \Ep"i*stome\, n. [NL. epistoma, fr. Gr. 'epi` upon + ?, ?, mouth.] (Zo["o]l.)

  1. The region between the antenn[ae] and the mouth, in Crustacea.

  2. A liplike organ that covers the mouth, in most Bryozoa. See Illust., under Entoprocta. [1913 Webster] ||


n. 1 (context zoology English) a mouth-covering lobe or ridge in bryozoans and phoronids 2 a plate in front of the mouth of some types of crustacean