Etymology

ammonium

A1M3M3O1N1I1U1M3

Today it means: The univalent NH₄⁺ cation, derived by the protonation of ammonia Full definition →

New Latin ammōnium
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The story

  1. New Latin · borrowed fromammōnium
  2. English todayammonium

From New Latin ammōnium. Equivalent to ammonia + -ium.

Etymology from Wiktionary, CC BY-SA 4.0.