noun Chemistry.
a hydrate that contains two molecules of water, as potassium sulfite, K 2 SO 3 ⋅2H 2 O.

di-1 + hydrate

dihydrated, adjective
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dihydrate di·hy·drate (dī-hī'drāt')
A chemical compound containing two molecules of water.

The American Heritage® Stedman's Medical Dictionary
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