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Crystallog a local deviation from regularity in the crystal lattice of a solid
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
In lumber, an irregularity occurring in or on wood that will tend to impair its strength, durability, or utility value.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
(science and technology)
An irregularity that spoils the appearance or impairs the usefulness or effectiveness of an object or a material by causing weakness or failure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
In wood, a fault that may reduce its durability, usefulness, or strength.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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