peristomium
noun
peri·sto·mi·um
\ˌperəˈstōmēəm\
Definition of peristomium
peristomia
\-ēə\: peristome; especially : the foremost true segment of an annelid worm usually bearing the mouth
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Origin and Etymology of peristomium
New Latin, from peri- + stom- + -ium
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