Etymology

autotransformer

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Today it means: A transformer with a single winding, its output being taken from taps. Full definition →

English transformer ← Middle English transformen ← Middle French transfourmer
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The story

  1. Englishauto-
  2. Proto-Indo-European*terh₂-
  3. Proto-Indo-European*térh₂t
  4. Proto-Indo-European*tr̥h₂ónts
  5. Proto-Indo-European*tr̥h₂n̥ts
  6. Proto-Italic*trāns
  7. Proto-Italic*trāns-
  8. Latintrāns-
  9. Ancient Greekμορφή (morphḗ)der.?
  10. Latinfōrma
  11. Latinfōrmō
  12. Latintransformo
  13. Old Frenchtransformer
  14. Middle Frenchtransfourmer
  15. Middle Englishtransformen
  16. Englishtransform
  17. Englishtransformer
  18. English todayautotransformer

From auto- + transformer.

Etymology from Wiktionary, CC BY-SA 4.0.