integral mullion


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impost

1. A masonry unit or course, often distinctively profiled, which receives and distributes the thrust at each end of an arch. Also see abutment, springer.
2. A vertical member in a gemel or double window taking the place of a mullion; an integral mullion.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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