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A narrow pane of glass at the edge of a sash window or door.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A framed area of glass that does not open, typically composed of a number of small fixed panes; commonly one of a pair of such lights, set vertically on each side of a door.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.