English
hydrocycle
From hydro- + cycle.
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Proto-Indo-European *kʷel- ‘to turn’
…
Proto-Hellenic *kúklos ‘circle, wheel’
Ancient Greek κύκλος ‘circle, ring’
Late Latin cyclus
Middle English cicle ‘fixed length period of years’
English cycle
Today it means
noun A small watercraft powered by pedals.
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrocycle