'Prostomia' definitions:

Definition of 'Prostomia'

From: GCIDE

Prostomium \Pro*sto"mi*um\, n.; pl. Prostomia. [NL., fr. Gr. ? before + ?, ?, mouth.] (Zool.) That portion of the head of an annelid situated in front of the mouth. -- {Pro*sto"mi*al}, a. [1913 Webster]