Prostomium
Pronunciation : Pro*sto"mi*um
Part of Speech : n.;
Etymology : [NL., fr. Gr. (Zo?l.)
Definition : Defn: That portion of the head of an annelid situated in front of the mouth. -- Pro*sto"mi*al, a.
pl. Prostomia.
Source : Webster's Unabridged Dictionary, 1913