Etymology

photometer

P3H4O1T1O1M3E1T1E1R1

Today it means: Any of several instruments used to measure various aspects of the intensity of light. Full definition →

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

  1. Proto-Indo-European*bʰeh₂-
  2. Proto-Indo-European*bʰéh₂os
  3. Proto-Hellenic*pʰáwos
  4. Ancient Greekφᾰ́ος (phắos)
  5. Ancient Greekφῶς (phôs)
  6. Ancient Greekφωτο- (phōto-)
  7. Englishphoto-
  8. Proto-Indo-European*med-
  9. Proto-Indo-European*meh₁-
  10. Ancient Greekμέτρον (métron)
  11. English todayphotometer

From photo- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.