English
hydrocool
From hydro- + cool.
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Proto-Indo-European *gel- ‘to be cold, to freeze’
…
Proto-Germanic *kōluz ‘cool’
Proto-West Germanic *kōl(ī)
Old English cōl ‘cool, cold, calm’
Middle English cool
English cool
Today it means
verb To cool by means of a hydrocooler.
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrocool