Etymology

thioxanthene

T1H4I1O1X8A1N1T1H4E1N1E1

Today it means: The tricyclic heterocycle (sulfur analogue of xanthene) consisting of two benzene rings fused to that of thiopyran Full definition →

English xanthene ← Ancient Greek θεῖον (theîon) ← Proto-Indo-European *dʰewh₂-der.?
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The story

  1. Proto-Indo-European*dʰewh₂-der.?
  2. Ancient Greekθέειον (théeion)
  3. Ancient Greekθεῖον (theîon)
  4. Englishthio-
  5. Englishxanthene
  6. English todaythioxanthene

From thio- + xanthene.

Etymology from Wiktionary, CC BY-SA 4.0.