Interpenetrate

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Interpenetrate

A decorative feature, such as a molding, that enters another element, such as a column, and reappears on the other side; it was commonly found in the Gothic Revival style.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
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Lewis that "the atomic shells were mutually interpenetrable" so that an electron "may form part of the shell of two different atoms" - later "a cardinal principle of the new quantum mechanics" (Brock 1992, p.