Embrasure /(?; 135)/

Em·bra·sure

Embrasure

n.
  1. An embrace. [Obs.]

Embrasure

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