a blade that can be attached to the muzzle of a rifle for stabbing in close combat
2.
a type of fastening in which a cylindrical member is inserted into a socket against spring pressure and turned so that pins on its side engage in slots in the socket
1610s, from Fr. baionnette (16c.), said to be from Bayonne, city in Gascony where they first were made; or perhaps it is a dim. of O.Fr. bayon "crossbow bolt." The city name is from L.L. baia "bay" + Basque on "good."