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Meaning of cuttlebone

cut•tle•bone

Pronunciation: (kut'l-bōn"), [key]
— n.
  1. the calcareous internal shell of cuttlefishes, used to make powder for polishing and fed to canaries and other pet birds to supply their diet with lime.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.