GNU Collaborative International Dictionary of English

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1.       
    ‖Epistoma (?), Epistome (?),  n. [NL. epistoma, fr. Gr. ἐπί 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.
   
   [1913 Webster]