from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A substance used to reduce the hardness of water.
- n. A device that monitors and reduces the hardness of the water.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A device which reduces the calcium and magnesium concentration of hard water by passing it through an ion exchange resin.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power
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