1. (in fortification) an opening, as a loophole or crenel, through which missiles may be discharged.
  2. Architecture. a splayed enlargement of a door or window toward the inner face of a wall.
  3. Dentistry. the space between adjacent teeth.


  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

1702, from French embrasure (16c.), from Old French embraser “to cut at a slant, make a groove or furrow in a door or window,” from en- “in” (see en- (1)) + braser “to cut at a slant.”


  1. The sloped valley between two teeth.

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