Butt-joint meaning

A joint formed by two abutting surfaces placed squarely together.
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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.
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(construction) A joint formed by adjacent, separate section of material, such as where two neighboring pieces of insulation abut.
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Origin of butt-joint

From butt