dead·bolt

[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. 2013.
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WordNet
deadbolt

noun
the part of a lock that is engaged or withdrawn with a key [syn: bolt
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Deadbolt is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
There was conflicting testimony as to whether this deadbolt was usually locked.
It is the same as the single cylinder deadbolt, except the keyway on both sides
  of the door.
Beef up the door or cover and install a deadbolt lock or a strong hasp and
  padlock.
Every door should be secured with a single-cylinder deadbolt lock.
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