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.

< Neo-Latin; see ammonia, -ium; coined by J. J. Berzelius in 1808 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ammonium (əˈməʊnɪəm, -njəm)
(modifier) of, consisting of, or containing the monovalent group NH4-- or the ion NH4+: ammonium compounds

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
ammonium   (ə-mō'nē-əm)  Pronunciation Key 
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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Example sentences
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.
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