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Dictionary

hy•drate

Pronunciation: (hī'drāt), [key]
—n., v., -drat•ed, -drat•ing.

—n.
any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na₂CO₃·10H₂O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO₃·H₂O, or H₂SO₄, it is strongly held as water of constitution.

—v.t., v.i.
to combine chemically with water.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

hydrastis

hydrated

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