bayonet
Concise Oxford English Dictionary © 2008 Oxford University Press:
bayonet/ˈbeɪənət/
▶noun
- 1 a long blade fixed to the muzzle of a rifle for use in hand-to-hand fighting.
- 2 [as modifier] denoting a type of fitting for a light bulb or other appliance which is pushed into a socket and then twisted into place.
– origin C17 (denoting a kind of short dagger): from Fr. baïonnette, from Bayonne, a town in SW France, where they were first made.
'bayonet' also found in these Oxford entries:

