Etymology

dioptometer

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Today it means: An instrument used to measure ocular refraction, in order to prescribe corrective lenses. Full definition →

English opto- ← Ancient Greek ὀπτός (optós) ← Latin di-
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The story

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*dwi-
  3. Proto-Hellenic*dwi-
  4. Ancient Greekδῐ- (dĭ-)
  5. Latindi-
  6. Englishdi-
  7. Ancient Greekὀπτός (optós)
  8. Englishopto-
  9. English todaydioptometer

From di- + opto- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.