cuttlebone

[kuht-l-bohn]
noun
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.

Origin:
1805–15; cuttle(fish) + bone

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World English Dictionary
cuttlebone (ˈkʌtəlˌbəʊn)
 
n
the internal calcareous shell of the cuttlefish, used as a mineral supplement to the diet of cage-birds and as a polishing agent

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
We are currently looking at cuttlebone and bird skulls to help design more efficient concrete structures for office buildings.
Chitosan was prepared from natural cuttlebone wastes.
Remove oyster shell, mineral blocks, and cuttlebone.
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