‖Vi‐brac″u‐lum (?), n.; pl.Vibracula (#). [NL., dim. from L. vibrare to vibrate.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.