noun

• (architecture, military) Any of the indentations between the merlons of a battlement; an opening in a wall or parapet through which ordnance can be fired.
  "Near-synonym: crenel (sometimes hyponymous technically)"
• (figurative) Any small protected space.
  "She had a special seat there, a little embrasure between two upright slabs of sandstone, which was sheltered and private."
• (obsolete) An embrace.
  "And suddenly; where injury of chance / Puts back leave-taking, justles roughly by / All time of pause, rudely beguiles our lips / Of all rejoindure, forcibly prevents / Our lock'd embrasures, strangles our dear vows / Even in the birth of our own labouring breath:"