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prostomium

pro·sto·mi·um [ prō stṓmee əm ] (plural pro·sto·mi·a [ prō stṓmee ə ])


noun 
Definition:
 
part of worm's head: the part of the head of some worms such as the earthworm that is in front of the mouth

[Late 19th century. Via modern Latin< Greek prostomion "something in front of the mouth" < stoma "mouth"]

pros·to·mi·al adjective
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