|1.||fortifications an opening or indentation, as in a battlement, for shooting through|
|2.||an opening forming a door or window, having splayed sides that increase the width of the opening in the interior|
|[C18: from French, from obsolete embraser to widen, of uncertain origin]|
embrasure em·bra·sure (ěm-brā'zhər)
The sloped valley between two teeth.