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A stone joining the coping above a gable to the wall.
A masonry stone set with its longest dimension perpendicular to the wall face to bind the wall together. Also known as bonder.
In stone masonry, a stone usually set with its longest dimension perpendicular to the wall face so as to tie the masonry wall to its wall backing. A very large bondstone may be set with its long dimension parallel to the wall face and still serve as a bonder, provided that its width is sufficiently large to tie it to the wall backing.