Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun In chem., a compound containing water in the proportion of half a molecule for one molecule of another substance, as a salt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry A hydrate whose solid contains one molecule of water of crystallization per two molecules, or per two unit cells

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

hemi- + hydrate

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