{ ‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.