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feather joint
noun
Definition of feather joint
1 : a joint formed by making a mating groove in each of the contiguous pieces and inserting a feather in the opening formed when the pieces are butted together
2 : one of a set of joints that are developed by shear and tension in a zone of deformation of the earth's crust (as along a fault) and that resemble in pattern the barbs and shaft of a feather
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