• synonyms


noun Chemistry.
  1. a hydrate that contains one molecule of water, as ammonium carbonate, (NH4)2CO3·H2O.
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Origin of monohydrate

First recorded in 1850–55; mono- + hydrate
Related formsmon·o·hy·drat·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for monohydrate

Historical Examples

  • At temperatures above 0, barium acetate can form two stable hydrates, a trihydrate and a monohydrate.

    The Phase Rule and Its Applications

    Alexander Findlay

  • The curve of the latter hydrate extends to 175.5 (L), and is then succeeded by the curve for the monohydrate.

  • Before the melting point of the monohydrate is reached, two liquid phases are formed, as in the case of sulphur dioxide and water.

  • This is, therefore, the transition temperature for the trihydrate and monohydrate.

British Dictionary definitions for monohydrate


  1. a hydrate, such as ferrous sulphate monohydrate, FeSO 4 .H 2 O, containing one molecule of water per molecule of the compound
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Derived Formsmonohydrated, adjective
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

monohydrate in Medicine


  1. A compound, such as calcium chloride monohydrate, that contains one molecule of water.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.