Em‐bra″sure (277), n. [F., fr. embraser, perh. equiv. to ébraser to widen an opening; of unknown origin.] 1. (Arch.) A splay of a door or window.
Apart, in the twilight gloom of a window's embrasure,
Sat the lovers. Longfellow.
2. (Fort.) An aperture with slant sides in a wall or parapet, through which cannon are pointed and discharged; a crenelle. See Illust. of Casemate.