Pronunciation: (chub),[key] —n., —pl.(esp. collectively)chub,(esp. referring to two or more kinds or species)chubs. 1. a common freshwater fish, Leuciscus cephalus, of European waters, having a thick, fusiform body.
2. any of various related fishes.
3. any of several unrelated American fishes, esp. the tautog and whitefishes of the genus Coregonus, of the Great Lakes.