adjective Chemistry.
with all water removed, especially water of crystallization.

1810–20; < Greek ánȳdros waterless (with etymological h restored). See an-1, hydro-1, -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anhydrous (ænˈhaɪdrəs)
containing no water, esp no water of crystallization
[C19: from Greek anudros; see an-, hydro-]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"containing no water," 1819, a modern coinage from Gk. an- privative prefix + hydor "water" (see water (n.1)). Gk. did have anhydros "waterless," used of arid lands or corpses that had not been given proper funeral rites.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anhydrous an·hy·drous (ān-hī'drəs)
Without water, especially water of crystallization.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
anhydrous   (ān-hī'drəs)  Pronunciation Key 
Not containing water, especially water of crystallization.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Indeed, the next category on the beauty horizon is anhydrous products, which do not require water to use them.
Anhydrous hydrogen chloride is hydrogen chloride that is free from water.
Records note workers' exposure to anhydrous chlorine and boron trichloride vapors.
Anhydrous ammonia is a major source of nitrogen as a fertilizer for corn and other crops.
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