\E*pis"to*ma\, Epistome \Ep"i*stome\, n. [NL. epistoma,
fr. Gr. 'epi` upon + ?, ?, mouth.] (Zo["o]l.)
(a) The region between the antenn[ae] and the mouth, in
    Crustacea.
(b) A liplike organ that covers the mouth, in most Bryozoa.
    See Illust., under {Entoprocta}.