English
hydrosphere
From hydro- + -sphere.
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ὕδωρ ‘water’
English hydro
Proto-Indo-European *sperH- ‘to kick, rebound, move convulsively’
…
Latin sphaera ‘ball, globe, celestial sphere’
Late Latin sphēra
Old French sphere ‘sphere (shape)’
Middle English spere ‘the cosmos, outer space’
English sphere
Today it means
noun All the liquid waters of the Earth or another astronomical body, as distinguished from the land and the gases of the atmosphere.
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrosphere