Etymology

off-gas

Today it means: Gas produced as a side effect of a chemical reaction, sometimes hazardous. Full definition →

English gas ← Dutch gas ← Ancient Greek χάος (kháos)
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The story

  1. Englishoff-
  2. Proto-Indo-European*ǵʰeh₂-
  3. Ancient Greekχαῦνος (khaûnos)
  4. Ancient Greekχάος (kháos)
  5. Dutchgas
  6. Englishgas
  7. English todayoff-gas

From off- + gas.

Etymology from Wiktionary, CC BY-SA 4.0.