van der Waals radius
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van der Waals radius[¦van·dər‚wälz ′rād·ē·əs]
One-half the distance between two atoms of an element that are as close to each other as possible without being formally bonded to each other except for van der Waals forces.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.