Etymology

reflectometer

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Today it means: An instrument used to measure the reflectance of a surface. Full definition →

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

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

From reflect + -o- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.