English

hydronium

From hydro- + onium.

A compound of hydro- + onium

Proto-Indo-European *wed- ‘water’

Proto-Indo-European *wódr̥ ‘water’

Proto-Hellenic *údōr ‘water’

Ancient Greek ῡ̆̔́δωρ ‘water’

New Latin ammōnium

English ammonium

English onium

Today it means

noun The hydrated hydrogen ion, H₃O⁺.

Language periods are conventional ranges, not dates for this word.

Etymograph / hydronium