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The part of a wall between the sill of a window and the head of the window below it.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The triangular space that is formed between the sides of adjacent arches and the line across their tops; in a skeletal frame building, the walls inside the columns and between the top of the windows and the sill above.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
1. An area, roughly triangular in shape, included between the extradoses of two adjoining arches and a line approximately connecting their crowns (or a space approximately equal to half this in the case of a single arch); in medieval architecture, often ornamented with tracery, etc.
2. In a multistory building, a wall panel filling the space between the top of the window in one story and the sill of the window in the story above.
3. A surface, roughly triangular in shape, as below a stair string.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.