The Collaborative International Dictionary of English v.0.48:
Astomatous \A*stom"a*tous\, Astomous \As"to*mous\, a. [Gr. 'a priv. + ?, ?, mouth.] Not possessing a mouth. [1913 Webster] AstonWordNet (r) 3.0 (2006):
astomatous adj 1: having no mouth or mouthlike opening [syn: astomatous, mouthless] [ant: stomatous]