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dead bolt[′ded ‚bōlt]
A lock bolt that is moved directly by the turning of a knob or key, not by spring action.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A bolt with a square head controlled directly by the key when moved in either direction.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A type of door lock; the bolt, which is square in cross section, is operated by the door key or a turn piece.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.