cut·tle·bone 
(kŭtl-bōn′)
(kŭtl-bōn′)n.
The calcareous internal shell of a cuttlefish, used as a dietary supplement for cage birds or as a mold for metal casting.
[Middle English cotilbone : codel, cotil, cuttlefish; see CUTTLEFISH + bone, bone; see BONE.]
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