from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A salt, such as alum, that ionizes in solution as if it were two separate salts but forms a single substance upon crystallization.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A solid solution of two simple salts, often in a definite proportion

from the GNU version of the Collaborative International Dictionary of English

  • adj. A molecular combination of two distinct salts, as common alum, which consists of the sulphate of aluminium, and the sulphate of potassium or ammonium.
  • n. a salt regarded as formed by the union of two distinct salts, as common alum, potassium aluminium sulphate. See under Double.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a solution of two simple salts that forms a single substance on crystallization


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