English
hydron
From hydro- + -on.
A compound of hydro- + -on
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Today it means
noun any hydrogen cation, e.g. a proton (¹H⁺)
Language periods are conventional ranges, not dates for this word.
Etymograph / hydron