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[uh-moh-nee-uh m] /əˈmoʊ ni əm/
noun, Chemistry
the univalent ion, NH 4 + , or group, NH 4 , which plays the part of a metal in the salt formed when ammonia reacts with an acid.
Origin of ammonium
< New Latin; see ammonia, -ium; coined by J. J. Berzelius in 1808 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ammonium
  • Today roughly half the nitrogen atoms in an average human body have come through an ammonium factory.
  • ammonium hydroxide is a colorless liquid chemical solution that forms when ammonia dissolves in water.
  • While a cargo ship was being loaded with ammonium nitrate, a fire began which forced the nitrate to explode.
  • Producers add sulfuric acid to form phosphoric acid, which is later converted to ammonium phosphate.
  • ammonium bicarbonate is used in digestive biscuit manufacture.
British Dictionary definitions for ammonium


/əˈməʊnɪəm; -njəm/
(modifier) of, consisting of, or containing the monovalent group NH4– or the ion NH4+: ammonium compounds
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ammonium in Medicine

ammonium am·mo·ni·um (ə-mō'nē-əm)
The univalent radical NH4+, that is derived from ammonia and that reacts as a univalent metal in forming ammonium compounds.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ammonium in Science
A positively charged ion, NH4, derived from ammonia and found in a wide variety of organic and inorganic compounds. Compounds of ammonium chemically resemble the alkali metals.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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