Dictionary![]() ![]() dec•a•hy•dratePronunciation: (dek"u-hī'drit, -drāt), [key] —n. Chem. a hydrate that contains ten molecules of water, as washing soda, Na2CO3·10H2O. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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