AMMONIUM

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am⋅mo⋅ni⋅um

[uh-moh-nee-uh

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–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:
< NL; see ammonia, -ium; coined by J. J. Berzelius in 1808

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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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.

[ammon(ia) + -ium.]

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: am·mo·ni·um
Pronunciation: &-'mO-nE-&m
Function: noun
: an ion NH₄⁺derived from ammonia bycombination with a hydrogen ion and known in organic compounds (as quaternary ammonium compounds) and in compounds (as salts) that resemble in properties the compounds of the alkali metals

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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.

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