Etymology

thiosulphuric

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English sulphuric ← 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. Englishsulphuric
  6. English todaythiosulphuric

From thio- + sulphuric.

Etymology from Wiktionary, CC BY-SA 4.0.