• Webster's Revised Unabridged Dictionary
    • n Deadlatch 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.
    • ***
Century Dictionary and Cyclopedia
    • n deadlatch A latch which is held in its place by a catch, or of which the bolt may be so locked by a detent that it cannot be raised by the latch-key from the outside, nor by the handle from within.
    • ***


In literature:

The jerk of a ceiling cord slammed the door shut and it was deadlatched, requiring a key to open it.
"Radio Boys Loyalty" by Wayne Whipple

In news:

Saw Tooth Locators on Deadlatch Ramp.
The patented Steel Hawk 4300 Series is Adams Rite's non-handed electrified deadlatch designed for aluminum glass storefront doors.
The Adams Rite eForce-150 is a battery-operated keyless entry control for Adams Rite deadbolts, deadlatches and exit devices that are compatible with aluminum, steel and wood doors.
The new non-handed Steel Hawk 4300 deadlatch by Adams Rite is now the easiest way to electrify an aluminum entrance door.
Our deadbolts, deadlatches and paddles have been cycle tested to exceed ANSI Grade 1 standards.