Etymology

coumarone

C3O1U1M3A1R1O1N1E1

Today it means: The bicyclic heterocycle benzofuran. Full definition →

English ketone ← German Keton ← French coumarine
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The story

  1. Old Tupikumar
  2. Frenchcoumarou
  3. Frenchcoumarine
  4. GermanKeton
  5. Englishketone
  6. English todaycoumarone

From French coumarine + English -one.

Etymology from Wiktionary, CC BY-SA 4.0.