单词	cuttlebone
释义	cuttlebone /ˈkʌtlbəʊn / noun The flattened oval internal skeleton of the cuttlefish, which is made of white lightweight chalky material. It is used as a dietary supplement for cage birds and for making casts for precious metal items: parakeets require only a cuttlebone to hone their beaks [mass noun]: cuttlebone has long been used for casting pieces of jewellery... Almost any bird needs a cuttlebone or mineral equivalent to keep their bones healthy and beaks sharp. Another item that should be kept in your parakeet's cage is either a cuttlebone or a mineral block. Both groups had access to cuttlebone and fresh water ad libitum.
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