butt joint

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

• noun A joint formed by two abutting surfaces placed squarely together.

from The Century Dictionary.

• noun Same as butting-joint.

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

• A joint in which the edges or ends of the pieces united come squarely together instead of overlapping. See 1st butt, 8.

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

• noun construction A joint formed by adjacent, separate section of material, such as where two neighboring pieces of insulation abut.

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

• noun a joint made by fastening ends together without overlapping