cuttlebone

/ˈkʌtl̩bəʊn/

Etymology

From Middle English cotilbone [and other forms], from cotil, cutil, codel (“cuttlefish; cuttlebone”) (from Old English cudele (“cuttlefish”), ultimately from Proto-Indo-European *gew- (“to bend, to curve; an arch; a vault”)) + bon (“bone”) (from Old English bān (“bone”), ultimately from Proto-Indo-European *bʰeyh₂- (“to hit, strike; to cut, hew”)). The English word is analysable as cuttle (“cuttlefish”) + bone.

noun

Synonym of cuttlefish bone (“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”).