anhydrous

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anhydrous

containing no water, esp no water of crystallization
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

anhydrous

[an′hī·drəs]
(chemistry)
Being without water, especially water of hydration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.