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bayonet socket

noun
  1. a cylindrical socket having one or more L-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.
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Origin of bayonet socket

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018