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A loophole or similar aperture in a medieval wall, most often cruciform in shape, through which bowmen fired arrows.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
In medieval battlements, a cross-shaped aperture through which crossbowmen shot arrows.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.