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Meaning of vibraculum

vi•brac•u•lum

Pronunciation: (vī-brak'yu-lum), [key]
— pl. -la
  1. any of the modified polyps on the surface of certain bryozoan colonies, having a long, whiplike appendage that clears away debris.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.