·noun A splay of a door or window.
II. Embrasure ·noun An Embrace.
III. Embrasure ·noun An aperture with slant sides in a wall or parapet, through which cannon are pointed and discharged; a crenelle. ·see ·Illust. of Casemate.
The interior faces or sides of an embrasure. ...
The Sailor's Word-Book