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Meaning of bayonet socket

bay'onet sock"et

Pronunciation: [key]
  1. a cylindrical socket having one or more-shaped slots, the longer side parallel and the shorter side perpendicular to the axis of the socket, along which a knoblike projection on the object slides in such a way that a twist of the object when fully inserted locks it into place.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.