IPA: /ˈfɪʃˌboʊn/
KK: /ˈfɪʃboʊn/
A small, thin bone found in the body of a fish.
Be careful when eating the fish; there might be a fishbone in it.
Fishbone → The word is formed from "fish" (from Old English *fisc*, meaning a gilled aquatic animal) and "bone" (from Old English *ban*, meaning the hard structure that makes up the skeleton of vertebrates). Together, these parts describe the bony structure found in a fish.
Think of a 'gilled aquatic animal' ('fish') and its 'hard structure' ('bone') — that's what a fishbone is, the bony part of a fish.