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A hydrate in which the molecular ratio of water molecules to anhydrous compound is 1:2.

hem′i·hy′drat′ed adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Chemistry) chem a hydrate in which there are two molecules of substance to every molecule of water
ˌhemiˈhydrated adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌhɛm ɪˈhaɪ dreɪt)

a hydrate in which there are two molecules of the compound for each molecule of water.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Fars, "Analysis and Optimization of Using Hemihydrates Plaster ([beta]) for Casting Mould in Sanitary ware Industry," Ceram.
Calcium sulphate hemihydrates (gypsum) is an ionic solid and is therefore essentially hydrophilic.23
In 2008, for instance, the Indian Patent Office rejected a patent application for Viramune Suspension (nevirapine hemihydrates), a syrup form of Viramune (nevirapine), which is important for children living with HIV who are unable to swallow tablets, as a "new form" of a "known substance".