ammonium

[uh-moh-nee-uhm]

am·mo·ni·um

[uh-moh-nee-uhm]
noun Chemistry.
the univalent ion, NH4+, or group, NH4, which plays the part of a metal in the salt formed when ammonia reacts with an acid.

Origin:
< Neo-Latin; see ammonia, -ium; coined by J. J. Berzelius in 1808
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ammonium is always a great word to know.
So is saturated. Does it mean:
a colorless, oily, water-soluble, highly toxic, liquid alkaloid, C10H14N2, found in tobacco and valued as an insecticide
a solution containing the maximum amount of solute capable of being dissolved under given conditions
Collins
World English Dictionary
ammonium (əˈməʊnɪəm, -njəm)
 
n
(modifier) of, consisting of, or containing the monovalent group NH4-- or the ion NH4+: ammonium compounds

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ammonium am·mo·ni·um (ə-mō'nē-əm)
n.
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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