from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The univalent chemical ion NH4+, derived from ammonia, whose compounds chemically resemble the alkali metals.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The univalent NH4+ cation, derived by the protonation of ammonia.

from the GNU version of the Collaborative International Dictionary of English

  • n. A compound radical, NH4, having the chemical relations of a strongly basic element like the alkali metals.

from The Century Dictionary and Cyclopedia

  • n. A name given to the hypothetical base (NH4) of ammonia, analogous to a metal, as potassium. .

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion


ammon(ia) + -ium.
(American Heritage® Dictionary of the English Language, Fourth Edition)
ammonia +‎ -ium (Wiktionary)



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