Etymology

gaseous

G2A1S1E1O1U1S1

Today it means: Relating to, or existing as gas (matter in an intermediate state between liquid and plasma). Full definition →

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

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

From gas + -eous.

Etymology from Wiktionary, CC BY-SA 4.0.