Definition of bayonet noun from the Oxford Advanced Learner's Dictionary

BrE BrE//ˈbeɪənət//
 
; NAmE NAmE//ˈbeɪənət//
 
a long, sharp knife that is fastened onto the end of a rifle and used as a weapon in battle troops with fixed bayonets See related entries: Weapons
Word Origin late 17th cent. (denoting a kind of short dagger): from French baïonnette, from Bayonne, the name of a town in SW France, where they were first made.
See the Oxford Advanced American Dictionary entry: bayonet

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