English
hydrognosy
From hydro- + -gnosy.
Formed from hydro- + -gnosy
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Today it means
noun The scientific description of the waters of the Earth.
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrognosy