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peristomium

noun peri·sto·mi·um \ ˌperəˈstōmēəm \

Definition of peristomium

plural 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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