Etymology

octyl

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Today it means: Any of very many isomeric univalent hydrocarbon radicals, C₈H₁₇, formally derived from octane by the loss of a hydrogen atom Full definition →

Ancient Greek ῡ̔́λη (hū́lē) ← Proto-Indo-European *swel-der.? ← English octane
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The story

  1. Englishoctane
  2. Proto-Indo-European*swel-der.?
  3. Ancient Greekῡ̔́λη (hū́lē)
  4. English todayoctyl

From octane + -yl.

Etymology from Wiktionary, CC BY-SA 4.0.