- 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 of ammonium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ammonium
Ammonium nitrate is extremely common, and pretty dangerous, and also extremely useful.The Most Dangerous Substance in America May Be Fertilizer
April 19, 2013
The solution may be regarded as containing the ammonium cellulose xanthate.Researches on Cellulose
C. F. Cross
On account of the formation of an ammonium salt in the reaction.
Do not mistake the fumes of the acid for those of ammonium chlorid.
Add an excess of ammonia, then a drop or two of ammonium sulfid.
An aqueous solution in the cold is not precipitated by oxalate of ammonium.Cooley's Practical Receipts, Volume II
- (modifier) of, consisting of, or containing the monovalent group NH 4 – or the ion NH 4 +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
- 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.
- 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.