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    cuttlebone

    US /'kʌtəlˌboʊn/

    ・

    UK /'kʌtlˌbəʊn/

    A1
    n.NounThe internal shell of a cuttlefish, used for buoyancy.
    The cuttlebone is an internal shell found in cuttlefish.
    n.NounThe internal shell of a cuttlefish, often given to caged birds and other pets as a source of calcium and for beak trimming.
    Many bird owners provide cuttlebone for their pets to sharpen their beaks and supplement calcium.

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