9 letters · 13 points in Scrabble
noun an opening (in a wall or ship or armored vehicle) for firing through
originFrom French embrasure, from embras(er) + -ure, from Old French embrasure (“cut at a slant, make a groove or furrow”), from em- + braser (“cut at a slant”).
Etymology from Wiktionary, CC BY-SA 3.0