The Collaborative International Dictionary
Epistoma
Epistoma \E*pis"to*ma\, Epistome \Ep"i*stome\, n. [NL. epistoma, fr. Gr. 'epi` upon + ?, ?, mouth.] (Zo["o]l.)
The region between the antenn[ae] and the mouth, in Crustacea.
A liplike organ that covers the mouth, in most Bryozoa. See Illust., under Entoprocta. [1913 Webster] ||
Wiktionary
epistoma
n. (alternative form of epistome English)