Etymology

iso-octane

Today it means: Any isomer of octane except the normal, straight-chain one; especially 2,2,4-trimethylpentane. Full definition →

English octane ← Ancient Greek ῐ̓́σος (ĭ́sos)
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The story

  1. Ancient Greekῐ̓́σος (ĭ́sos)
  2. Englishiso-
  3. Englishoctane
  4. English todayiso-octane

From iso- + octane.

Etymology from Wiktionary, CC BY-SA 4.0.