pith knot
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(′pith ′nät)
(materials) A small knot with a diameter of 0.25 inch (0.64 centimeter) or less in a wood board that has a pith hole.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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