embrasure
noun/ɪmˈbreɪʒə(r)/
/ɪmˈbreɪʒər/
(architecture)- an opening in a wall for a door or window, wider on the inside than on the outsideWord Originearly 18th cent.: from French, from obsolete embraser (earlier form of ébraser) ‘widen a door or window opening’, of unknown ultimate origin.
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embrasure