1.n. The region between the antennæ and the mouth, in Crustacea.
Medical Definition of Epistoma
1. The region between the antennae and the mouth, in Crustacea.
A liplike organ that covers the mouth, in most Bryozoa.
Origin: NL. Epistoma, fr. Gr. Upon +, mouth.
Source: Websters Dictionary
(01 Mar 1998)