Etymology

birotunda

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Today it means: A structure made of two adjoined rotundas. Full definition →

English rotunda ← 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. Englishrotunda
  7. English todaybirotunda

From bi- + rotunda.

Etymology from Wiktionary, CC BY-SA 4.0.