• synonyms


[hahy-druh s]
  1. containing water.
  2. Chemistry. containing water or its elements in some kind of union, as in hydrates or hydroxides.
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Origin of hydrous

First recorded in 1820–30; hydr-1 + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hydrous

Historical Examples

  • Composition, a hydrous silicate of magnesia, much like that of serpentine.


    William J. Miller

  • According to Dana (System of Mineralogy 689), it is cimolite, a hydrous silicate of aluminium.

    De Re Metallica

    Georgius Agricola

  • Autunite, a hydrous phosphate of uranium and calcium, crystallizing in the rhombic system in yellow plates.

  • Hydrous, Hydruntum, Otranto, has as good a claim as a city can well have to be looked on as the end of the world.

  • Iolite is a hydrous magnesium and aluminium silicate, with ferrous iron partially replacing magnesium.

British Dictionary definitions for hydrous


  1. containing water
  2. (of a chemical compound) combined with water moleculeshydrous copper sulphate, CuSO 4 .5H 2 O
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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

hydrous in Science


  1. Containing water.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.