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Meaning of double salt

dou'ble salt'

Pronunciation: [key]
— Chem. Chem.
  1. a salt that crystallizes as a single substance but ionizes as two distinct salts when dissolved, as carnallite, KMgCl&multiplydot;6HO.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.