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
butt joint in American English
any joint made by fastening two pieces of wood or metal together end to end or at right angles without overlapping: it is sometimes strengthened with an added part or parts