A chemical compound that contains seven molecules of water bonded to or incorporated into its crystal structure.
From Greek 'hepta' (seven) + Latin 'hydra' (water) + '-ate' (chemical compound). Used in chemistry to specify hydrated compounds.
Epsom salt is famously a heptahydrate—those seven water molecules are so tightly bound that they give the salt its characteristic texture and properties, which is why it has been used for centuries in medicine and gardening!
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