Etymology

incest

in·cest
I1N1C3E1S1T1

Today it means: Sexual relations between close relatives, especially immediate family members and sometimes first cousins, usually considered taboo. Full definition →

Latin incestus
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The story

  1. Latin · learned borrowing fromincestus
  2. English todayincest

Learned borrowing from Latin incestus. Displaced Old English mǣġhǣmed (literally “relative-sex”). Doublet of inchaste.

Etymology from Wiktionary, CC BY-SA 4.0.