[ an-hahy-druh s ]
/ ænˈhaɪ drəs /

adjective Chemistry.

with all water removed, especially water of crystallization.


Nearby words

  1. anhydrase,
  2. anhydremia,
  3. anhydride,
  4. anhydrite,
  5. anhydro-,
  6. ani,
  7. aniakchak,
  8. aniakchak crater,
  9. anianiau,
  10. anicca

Origin of anhydrous

1810–20; < Greek ánȳdros waterless (with etymological h restored). See an-1, hydro-1, -ous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for anhydrous

British Dictionary definitions for anhydrous


/ (ænˈhaɪdrəs) /


containing no water, esp no water of crystallization

Word Origin for anhydrous

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.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for anhydrous


[ ăn-hīdrəs ]


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.

Science definitions for anhydrous


[ ăn-hīdrəs ]

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