The Collaborative International Dictionary
Deadlatch
Deadlatch \Dead"latch`\, n.
A kind of latch whose bolt may be so locked by a detent that
it can not be opened from the inside by the handle, or from
the outside by the latch key.
--Knight.
Wiktionary
deadlatch
n. A kind of latch whose bolt may be locked by a detent so that it can not be opened from the inside by the handle, or from the outside by the latch key.