[i'pistәmә]
n.
(甲壳类动物的)口上板,(昆虫的)口上突, 口上片

Epistoma \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}.
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