Etymology

hydronym

hy·dro·nym
H4Y4D2R1O1N1Y4M3

Today it means: The name of a river, lake, sea or any other body of water. Full definition →

Ancient Greek ὄνυμα (ónuma) ← English hydro- ← Proto-Hellenic *údōr
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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 Greekὄνυμα (ónuma)
  8. English todayhydronym

From hydro- (“water”) + -onym (“name”).

Etymology from Wiktionary, CC BY-SA 4.0.