Etymology

colorimetry

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Today it means: The science of measuring colours and assigning them numeric values. Full definition →

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

  1. Proto-Indo-European*ḱel-
  2. Proto-Indo-European*ḱélōs
  3. Proto-Italic*kelōs
  4. Old Latincolōs
  5. Latincolor
  6. Old Frenchcolor
  7. Anglo-Normancolur
  8. Middle Englishcolour
  9. Englishcolor
  10. Proto-Indo-European*med-
  11. Proto-Indo-European*meh₁-
  12. Ancient Greekμέτρον (métron)
  13. English todaycolorimetry

From color + -metry.

Etymology from Wiktionary, CC BY-SA 4.0.