- A hydrate whoever solid contains seven particles of liquid of crystallization per molecule, or per device cellular
- In chem., a compound containing seven particles of water, as common copperas in crystals, or ferrous sulphate heptahydrate (FeSO4.7H2O).
Sentence for "heptahydrate"
-  Green vitriol, ferrous sulphate heptahydrate,…
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