vibraculum

noun
vi·brac·u·lum | \ -yələm \
plural vibracula

Definition of vibraculum 

: one of the movable slender spinelike organs or parts with which bryozoans are furnished and which are specially modified zooids of nearly the same nature as avicularia

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History and Etymology for vibraculum

New Latin, from Latin vibrare to shake, vibrate + -culum -cle

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