A horizontal lintel above a window or doorway which slants downward toward the centerline; often containing a keystone at its center.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
lintel (i.e., horizontal structural member above a window) each end of which slants downward toward a centerline through the window; often has a keystone at its center.A
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.