butting joint

from The Century Dictionary.

• noun A joint formed by two pieces of timber or metal united endwise so that they come exactly against each other with a true joint; an abutting joint.

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

• A joint between two pieces of timber or wood, at the end of one or both, and either at right angles or oblique to the grain, as the joints which the struts and braces form with the truss posts; -- sometimes called abutting joint.