cantilevered window

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1. In medieval English architecture, chiefly residential, and derivatives: (a) a bay window corbeled out from the wall of an upper story; (b) a bay projecting, inside or out, extending a room; (c) a windowed bay or porch at the top of exterior stairs.
2. (rare) In medieval Continental structures and derivatives, a subsidiary bay, or a corbeled, enclosed feature, exterior or interior.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.