deadbolt

[ ded-bohlt ]
/ ˈdɛdˌboʊlt /

noun

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

Origin of deadbolt

Also called deadlock.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for deadbolt