A compound with all water removed, especially water of hydration.

Ethanol produced for fuel use is often referred to as anhydrous ethanol, as it has had almost all water removed.

strongly heating copper(II) sulphate pentahydrate (CuSO4.5H2O) produces anhydrous copper(II) sulphate (CuSO4).

See also: Hydrate, Hydrous, Water.

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Subjects: Chemistry