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cuttlefish bone noun

  /ˌkʌt(ə)lˌfɪʃ ˈboʊn/ , /ˌkʌtl̩fɪʃ ˈbəʊn/ , [-ɾ(ə)l-]
  • The calcareous, oval-shaped internal shell of a cuttlefish (order Sepiida), originally used in powdered form as an antacid and for absorbing moisture or polishing objects, and now chiefly as a dietary supplement for cage birds.
 Schulp
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