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Meaning of hexahydrate

hex•a•hy•drate

Pronunciation: (hek"su-hī'drāt), [key]
— n.
  1. a hydrate that contains six molecules of water, as magnesium chloride, MgCl&multiplydot;6HO.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.