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From The Collaborative International Dictionary of English v.0.48:
Vibraculum \Vi*brac"u*lum\, n.; pl. Vibracula. [NL., dim. from L. vibrare to vibrate.] (Zool.) 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. [1913 Webster]