Source : Webster's Revised Unabridged Dictionary (1913)

Embrasure \Em*bra"sure\ (?; 135), n. [See {Embrace}.]
   An embrace. [Obs.] ``Our locked embrasures.'' --Shak.

Embrasure \Em*bra"sure\ (277), n. [F., fr. embraser, perh.
   equiv. to ['e]braser 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}.

Source : WordNet®

embrasure
     n : an opening (in a wall or ship or armored vehicle) for firing
         through [syn: {port}, {porthole}]