prostomium

noun
pro·​sto·​mi·​um | \prō-ˈstō-mē-əm \
plural prostomia\prō-​ˈstō-​mē-​ə \

Definition of prostomium 

: the portion of the head of an annelid worm (such as an earthworm) that is situated in front of the mouth

Other Words from prostomium

prostomial \prō-​ˈstō-​mē-​əl \ adjective

First Known Use of prostomium

1870, in the meaning defined above

History and Etymology for prostomium

New Latin, from Greek pro- + stoma mouth — more at stomach

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The first known use of prostomium was in 1870

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