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storm window[′stȯrm ‚win·dō]
A sash placed on the outside of an ordinary window to give added protection from the weather. Also known as storm sash.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An auxiliary window, usually placed with the existing window in the same frame, to provide additional protection against severe weather. See also: French window
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
storm window, storm sash
An extra window, usually placed on the outside of an existing window as additional protection against severe weather.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.