Webster's Revised Unabridged Dictionary · 1913

Embrasure

Embrasure (?; 135) , noun

[See Embrace.]

An embrace. [Obsolete]
Our locked embrasures. — Shakespeare

Embrasure (277) , noun

[French, from embraser, perh. equiv. to ébraser to widen an opening; of unknown origin.]

1.
(Architecture) A splay of a door or window.
Apart, in the twilight gloom of a window's embrasure, Sat the lovers. — Longfellow
2.
(Fortification) An aperture with slant sides in a wall or parapet, through which cannon are pointed and discharged; a crenelle. See Illust. of Casemate.