Etymology

adaptor

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English adapt ← Middle English *adapten ← Latin adaptō
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The story

  1. Proto-Indo-European*h₂éd
  2. Proto-Italic*ad
  3. Proto-Italic*ad-
  4. Latinad-
  5. Proto-Indo-European*h₂ep-
  6. Proto-Indo-European*h₂ptós
  7. Proto-Italic*aptos
  8. Latinaptus
  9. Proto-Indo-European[Term?]
  10. Proto-Italic*apjō
  11. Latinapiō
  12. Latinaptō
  13. Latinadaptō
  14. Middle English*adapten
  15. Englishadapt
  16. English todayadaptor

From adapt + -or.

Etymology from Wiktionary, CC BY-SA 4.0.