tentillum

noun
ten·til·lum | \ten‧ˈtiləm\
plural tentilla\-lə \

Definition of tentillum 

: a branch of a tentacle especially : one of the contractile branches that are rich in nematocysts and that occur on the tentacles of various siphonophores

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History and Etymology for tentillum

New Latin, from Latin tentare to feel + -illum, diminutive suffix

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