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hard water

water that contains magnesium, calcium, or iron salts and therefore forms a soap lather with difficulty. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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hard water in Culture

hard water definition

Water in which dissolved minerals make it difficult to produce a lather with soap.

Note: Hard water is usually associated with well water in regions where the rocks contain a large proportion of iron-bearing minerals.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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