Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
- a chemical compound added to hard water to soften it, as by precipitating out the minerals
- a tank or other container in which water is filtered through any of various chemicals or ion exchange media for softening
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- A substance used to reduce the hardness of water.
- A device that monitors and reduces the hardness of the water.