peronium

noun
pe·​ro·​ni·​um | \pəˈrōnēəm\
plural peronia\-​ēə \

Definition of peronium 

: a tract of modified epithelium between the margin of the umbrella and the base of a tentacle in some Hydromedusae

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History and Etymology for peronium

New Latin, from Greek peronion, small pin, diminutive of peronē pin, fibula

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