butt hinge
noun
1.
a hinge for a door or the like, secured to the butting surfaces rather than to the adjacent sides of the door and its frame.
Compare
flap
(def 20a).
Origin
1780-90
British Dictionary definitions for
butt hinge
butt hinge
noun
1.
a hinge made of two matching leaves, one recessed into a door and the other into the jamb so that they are in contact when the door is shut
sometimes shortened to
butt
1