butt hinge

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A hinge composed of two plates attached to abutting surfaces of a door and door jamb and joined by a pin.

from The Century Dictionary.

• noun Same as butt, 4.

from the GNU version of the Collaborative International Dictionary of English.

• See 1st butt, 10.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun carpentry A kind of hinge used in hanging doors, lid, covers, etc.; so named because fastened on the edge of the door, which butts against the frame, stop molding, and casing, instead of on its face, like the strap hinge; also called butt.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a hinge mortised flush into the edge of the door and jamb