Etymology

oto-

English ot- ← Ancient Greek ὠτ- (ōt-) ← Proto-Indo-European *h₂ṓws
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The story

  1. Proto-Indo-European*h₂ew-
  2. Proto-Indo-European*h₂ṓws
  3. Ancient Greekοὖς (oûs)
  4. Ancient Greekὠτ- (ōt-)
  5. Englishot-
  6. English todayoto-

From ot- + -o-.

Etymology from Wiktionary, CC BY-SA 4.0.