Pronunciation: pr ō - ' st ō -m ē - ə m
Function: noun
Inflected Form: plural -mia \ -m ē - ə \
Etymology: New Latin, from Greek pro- + stoma mouth ― more at STOMACH
Date: 1870
: the portion of the head of an annelid worm (as an earthworm) that is situated in front of the mouth
– pro · sto · mi · al \ -m ē - ə l \ adjective