arch stone

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A wedge-shaped masonry unit in an arch or vault whose converging sides are cut as radii of one of the centers of the arch or vault.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
27, 1978, the section of the rail bed in Douglas State Forest was taken by eminent domain from the Connecticut line to 1,600 feet after Arch Stone Bridge.
His solution was arches of great complexity with the arch stones gradually changing from aligning with the skew piers to lying at right angles to the line of the bridge at the crown - no mean geometrical problem.
David says the trial-and-error process of finding the right fit is "kind of tedious, but kind of fun." To form the arch above the firebox, David took a tip from ancient builders and assembled the arch stones over a temporary wooden form.