Etymology

heptyl

H4E1P3T1Y4L1

Today it means: Any of many isomeric univalent hydrocarbon radicals, C₇H₁₅, formally derived from heptane by the loss of a hydrogen atom. Full definition →

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

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

From heptane + -yl.

Etymology from Wiktionary, CC BY-SA 4.0.