Etymology

hydrosphere

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Today it means: All the liquid waters of the Earth or another astronomical body, as distinguished from the land and the gases of the atmosphere. Full definition →

English sphere ← Middle English spere ← Old French sphere
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The story

  1. Proto-Indo-European*wed-
  2. Proto-Indo-European*wódr̥
  3. Proto-Hellenic*údōr
  4. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
  5. Ancient Greekῠ̔δρο- (hŭdro-)
  6. Englishhydro-
  7. Ancient Greekσφαῖρᾰ (sphaîră)
  8. Latinsphaera
  9. Late Latinsphēra
  10. Old Frenchsphere
  11. Middle Englishspere
  12. Englishsphere
  13. English todayhydrosphere

From hydro- + -sphere.

Etymology from Wiktionary, CC BY-SA 4.0.