from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One of the long, whiplike, modified zooids on the surface of certain bryozoan colonies.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. One of the long filamentous or flagelliform appendages of the cells or ectocysts of many polyzoans, usually articulated with short dilated processes of the ectocyst, and executing constant lashing movements by the contraction of muscles contained in their dilated bases; a flabellarium.


New Latin vibrāculum, from Latin vibrāre, to shake; see vibrate.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • It is not easy to imagine two objects more widely different in appearance than a bristle or vibraculum, and an avicularium like the head of a bird; yet they are almost certainly homologous and have been developed from the same common source, namely a zooid with its cell.

    VII. Miscellaneous Objections to the Theory of Natural Selection


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