a joint formed by two pieces of wood or metal united end to end without overlapping.
Origin
1815-25
British Dictionary definitions for butt joint
butt joint
noun
1.
a joint between two plates, planks, bars, sections, etc, when the components are butted together and do not overlap or interlock. The joint may be strapped with jointing plates laid across it or welded (butt weld) Sometimes shortened to butt