Etymology

birotor

B3I1R1O1T1O1R1

Today it means: Having two rotors; having two main rotors. Full definition →

English rotor ← Latin bi- ← Proto-Italic *dwi-
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The story

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*dwi-
  3. Proto-Italic*dwi-
  4. Latinbi-
  5. Englishbi-
  6. Englishrotor
  7. English todaybirotor

From bi- + rotor. Late 19th to early 20th century, originally with reference to pumps.

Etymology from Wiktionary, CC BY-SA 4.0.