Etymology

hydronium

H4Y4D2R1O1N1I1U1M3

Today it means: The hydrated hydrogen ion, H₃O⁺. Full definition →

English onium ← New Latin ammōnium ← Ancient Greek ῠ̔δρο- (hŭdro-)
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The story

  1. Proto-Indo-European*wed-
  2. Proto-Indo-European*wódr̥
  3. Proto-Hellenic*údōr
  4. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
  5. Ancient Greekῠ̔δρο- (hŭdro-)
  6. Englishhydro-
  7. New Latinammōnium
  8. Englishammonium
  9. Englishonium
  10. English todayhydronium

From hydro- + onium.

Etymology from Wiktionary, CC BY-SA 4.0.