a lock bolt that is moved into position by the turning of a knob or key rather than by spring action.
Also called deadlock.

dead + bolt1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To deadbolt
Example sentences
Deadbolt locks are only as good as the door and frame they are installed in.
May be keyed entry lock with deadbolt, or stand-alone card reader lock.
Every door should be secured with a single-cylinder deadbolt lock.
It is the same as the single cylinder deadbolt, except the keyway on both sides
  of the door.
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