What does "ammonium" mean?

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

Ammonium

Common synonyms include: ammonium ion, ammoniated, ammonium compounds, ammonium salts, ammonium-based, ammonium-bearing.

/əˈmoʊni.əm/ noun

noun ·Rare ·Advanced level

Noun

1
The univalent NH₄⁺ cation, derived by the protonation of ammonia uncountable, usually
2
the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion wordnet
3
Any similar cation formed by replacing one or more hydrogen atoms with alkyl or aryl radicals especially, in-compounds, uncountable, usually

"Ammonium carbonate is an organic compound."

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