deadbolt

From dead +‎ bolt.

• (General American) IPA^(key): /ˈdɛdˌboʊlt/

deadbolt (plural deadbolts)

1. The part of the lock which is moved when the key is engaged.

   Coordinate term: latchbolt

2. A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so cannot be retracted except by turning the cylinder.

   Synonym: deadlock

deadbolt (third-person singular simple present deadbolts, present participle deadbolting, simple past and past participle deadbolted)

1. (transitive) To fasten or secure with a deadbolt.