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The Collaborative International Dictionary of English v.0.48:

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]