deadbolt

[ded-bohlt]
noun
a lock bolt that is moved into position by the turning of a knob or key rather than by spring action.
Also called deadlock.


Origin:
dead + bolt1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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