Etymology

incestuous

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Today it means: Pertaining to or engaging in incest. Full definition →

Proto-Indo-European *h₃édosder.? ← English incest
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The story

  1. Englishincest
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. English todayincestuous

From incest + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.