cuttlebone

cut.tle.bone

n.（名词）
The calcareous internal shell of a cuttlefish, used as a dietary supplement for cage birds or ground into powder for use as a polishing agent.
乌贼骨：乌贼的钙质内壳，作为笼中鸟的饮食补充物或把它碾碎成粉用作上光剂

来源：
Middle English
中古英语
Middle English codel, cutil [cuttlefish] * see cuttlefish
中古英语 codel, cutil [乌贼] *参见 cuttlefish
bone
bone