embrasure

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embrasure

an opening forming a door or window, having splayed sides that increase the width of the opening in the interior
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Embrasure

The crenels or spaces between the merlons of a battlement; an enlargement of a door or window opening at the inside face of a wall by means of splayed sides.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

embrasure

[em′brā·zhər]
(architecture)
Opening in a wall or parapet, especially one through which a gun is fired.
An opening such as for a door or window with sloping or beveled sides.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

embrasure

embrasure: B
1. The crenels or intervals between the merlons of a battlement.
2. An enlargement
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.