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Meaning of retinaculum

ret•i•nac•u•lum

Pronunciation: (ret"n-ak'yu-lum), [key]
— pl. -la
  1. any of various small structures that hook, clasp, or bind other structures to move them or hold them in place.
  2. a bristle on the butterfly forewing that clasps to the frenulum of the hindwing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.