ammonium

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am·mo·ni·um

 (ə-mō′nē-əm)
n.
The univalent chemical ion NH4+, derived from ammonia, whose compounds chemically resemble the alkali metals.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ammonium

(əˈməʊnɪəm; -njəm)
n
(Chemistry) (modifier) of, consisting of, or containing the monovalent group NH4– or the ion NH4+: ammonium compounds.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

am•mo•ni•um

(əˈmoʊ ni əm)

n.
the univalent ion, NH4 + , or group, NH4, which plays the part of a metal in the salt formed when ammonia reacts with an acid.
[1808;< New Latin; see ammonia, -ium2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

am·mo·ni·um

(ə-mō′nē-əm)
A positively charged ion, NH4, derived from ammonia and found in a wide variety of organic and inorganic compounds.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ammonium - the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
ammonia - a pungent gas compounded of nitrogen and hydrogen (NH3)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
amonij
암모늄

ammonium

[əˈməʊnɪəm]
A. Namonio m
B. CPD ammonium hydroxide Nhidróxido m amónico
ammonium sulphate Nsulfato m amónico
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

ammonium

[əˈməʊnɪəm] nammonio
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

ammonium

n amonio; — carbonate carbonato de amonio, carbonato amónico (esp. Esp)
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
A wing-nut molecule sticks to each of the four ammoniums. Charged sodium ions hover above and below the plane of the porphyrin, and a wing nut associates with each of these as well.
A long, flat molecule -- a diammonium salt with a central, hydrophobic (water-avoiding) region flanked by charged ammonium groups -- serves as a template for the complex.