Definition of "heptahydrate" []

• A hydrate whose solid contains seven molecules of water of crystallization per molecule, or per unit cell (noun)

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• "[46] Green vitriol, ferrous sulphate heptahydrate, a compound of iron, sulphur, and oxygen, crystallised with seven molecules of water, represented by the formula FeSO4."
• "Green vitriol is a heptahydrate of iron (II) sulfate or ferrous sulfate."
• "Another struggles with the simple inorganic salts required to make up buffer solutions, ortho, dihydrate, heptahydrate, anhydrous."