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peristomium

noun
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peri·​sto·​mi·​um | \ ˌperəˈstōmēəm \
plural peristomia\ -​ēə \

Definition of peristomium

: peristome especially : the foremost true segment of an annelid worm usually bearing the mouth

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History and Etymology for peristomium

New Latin, from peri- + stom- + -ium

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“Peristomium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peristomium. Accessed 4 Jul. 2020.

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