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The stone placed on the impost of a pier to receive the first stone of an arch.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
1. The stone which is placed on the impost of a pier to receive the first stone of an arch.
2. The part of the front of an Ionic capital between the abacus and echinus.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.