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Meaning of decahydrate

dec•a•hy•drate

Pronunciation: (dek"u-hī'drit, -drāt), [key]
— n. Chem.
  1. a hydrate that contains ten molecules of water, as washing soda, NaCO&multiplydot;10HO.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.