ammonium

[ uh-moh-nee-uh m ]

/ əˈmoʊ ni əm /

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.

Nearby words

ammonio-, ammonioferric oxalate, ammonite, ammonites, ammonitic, ammonium, ammonium acetate, ammonium bicarbonate, ammonium bifluoride, ammonium binoxalate, ammonium carbamate

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

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|DAILY BEAST
The ammonium picrate, and recently resorcine, have been used with success.
A System of Practical Medicine by American Authors, Vol. I|Various
Write the equation representing the action of ammonium sulphide upon chromium sulphate.
An Elementary Study of Chemistry|William McPherson
Ammonium carbonate, soap, and borax are practically harmless in their effect on the hair.
Principles and Practice of Fur Dressing and Fur Dyeing|William E. Austin

A solution of 50 grams of ammonium sulphide per liter of water is next brushed on, and the fur again dried.
Principles and Practice of Fur Dressing and Fur Dyeing|William E. Austin
Give chloride of ammonium in 30 grain doses to prevent delirium; strychnine or digitalin hypodermically.
Aids to Forensic Medicine and Toxicology|W. G. Aitchison Robertson

British Dictionary definitions for ammonium

ammonium

/ (əˈməʊnɪəm, -njəm) /

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

Medicine definitions for ammonium

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.

Science definitions for ammonium

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.