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1. A bar of wood or other material passing from one post or other support to another; a hand support along a stairway.
2. A structure consisting of rails and their sustaining posts, balusters, or pillars, and constituting an enclosure or a line of division, as a balcony rail.
3. A horizontal piece in a frame or paneling as a door rail, or in the framework of a window sash.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.