VIBRACULUM

Noun

vibraculum (plural vibracula)

A long, whiplike, modified zooid on the surface of certain colonies of bryozoa

Source: Wiktionary

Vi*brac"u*lum, n.; pl. Vibracula. Etym: [NL., dim. from L. vibrare to vibrate.] (Zoöl.)

Definition: One of the movable, slender, spinelike organs or parts with which certain bryozoans are furnished. They are regarded as specially modified zooids, of nearly the same nature as Avicularia.

Source: Webster’s Unabridged Dictionary 1913 Edition