ammonium

[uh-moh-nee-uh m]

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 of ammonium

< New Latin; see ammonia, -ium; coined by J. J. Berzelius in 1808

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ammonium

Contemporary Examples of ammonium

Ammonium nitrate is extremely common, and pretty dangerous, and also extremely useful.
The Most Dangerous Substance in America May Be Fertilizer
Megan McArdle
April 19, 2013

Historical Examples of ammonium

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.
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2.
Julius Stieglitz
Do not mistake the fumes of the acid for those of ammonium chlorid.
Detection of the Common Food Adulterants
Edwin M. Bruce
Add an excess of ammonia, then a drop or two of ammonium sulfid.
Detection of the Common Food Adulterants
Edwin M. Bruce
An aqueous solution in the cold is not precipitated by oxalate of ammonium.
Cooley's Practical Receipts, Volume II
Arnold Cooley

British Dictionary definitions for ammonium

ammonium

noun

(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

ammonium in Medicine

ammonium

[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.

ammonium in Science

ammonium

[ə-mō′nē-əm]

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.