Definition of embrasure noun from the Oxford Advanced Learner's Dictionary

 

embrasure

 noun
noun
BrE BrE//ɪmˈbreɪʒə(r)//
 
; NAmE NAmE//ɪmˈbreɪʒər//
 
(architecture)
 
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an opening in a wall for a door or window, wider on the inside than on the outside Word Origin early 18th cent.: from French, from obsolete embraser (earlier form of ébraser) ‘widen a door or window opening’, of unknown ultimate origin.
See the Oxford Advanced American Dictionary entry: embrasure