mortise lock

noun
a lock housed within a mortise in a door or the like, so that the lock mechanism is covered on both sides.

Origin:
1770–80

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World English Dictionary
mortise lock
 
n
a lock set into a mortise in a door so that the mechanism of the lock is enclosed by the door

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Door secured between posted hours through special mortise lock arrangement.
Any such locks in current use shall be phased out and replaced with mortise lock sets and standard cylinders.
The upper panels are curved at the top and the door has a mortise lock.
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