Etymology

refractometer

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Today it means: An optical instrument used to measure the refractive index of a substance. Full definition →

Ancient Greek μέτρον (métron) ← Proto-Indo-European *meh₁- ← English refract
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The story

  1. Englishrefract
  2. Proto-Indo-European*med-
  3. Proto-Indo-European*meh₁-
  4. Ancient Greekμέτρον (métron)
  5. English todayrefractometer

From refract + -o- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.