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[an-hahy-druh s]
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adjective Chemistry.
  1. with all water removed, especially water of crystallization.
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Origin of anhydrous

1810–20; < Greek ánȳdros waterless (with etymological h restored). See an-1, hydro-1, -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for anhydrous


  1. containing no water, esp no water of crystallization
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Word Origin

C19: from Greek anudros; see an-, hydro-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for anhydrous


"containing no water," 1819, a modern coinage from Greek an-, privative prefix (see an- (1)), + hydor "water" (see water (n.1)). Greek did have anhydros "waterless," used of arid lands or corpses that had not been given proper funeral rites.

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Online Etymology Dictionary, © 2010 Douglas Harper

anhydrous in Medicine


  1. Without water, especially water of crystallization.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

anhydrous in Science


  1. Not containing water, especially water of crystallization.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.