Etymology

selfcest

self·cest
S1E1L1F4C3E1S1T1

Today it means: Sexual activity with an alternate version of oneself, such as a clone, duplicate, alter ego, or a version of oneself from a different time or alternate universe. Full definition →

English incest ← Middle English self ← Old English self
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The story

  1. Proto-Indo-European*swé?
  2. Proto-Indo-European*selbʰ-
  3. Proto-Germanic*selbaz
  4. Old Englishself
  5. Middle Englishself
  6. Englishself
  7. Englishincest
  8. English todayselfcest

From self + -cest.

Etymology from Wiktionary, CC BY-SA 4.0.