Epistoma

{ ‖E‐pis″to‐ma (?), Ep″i‐stome (?), } n. [NL. epistoma, fr. Gr. επἴ upon + �, �, mouth.] (Zoöl.) (a) The region between the antennæ and the mouth, in Crustacea. (b) A liplike organ that covers the mouth, in most Bryozoa. See Illust., under Entoprocta.