Etymology

binormal

B3I1N1O1R1M3A1L1

Today it means: A line that is at right angles to both the normal and the tangent of a point on a curve and, together with them, forms three orthogonal axes. Full definition →

English normal ← Latin nōrmālis ← 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. Latinnorma
  7. Latinnōrmālis
  8. Englishnormal
  9. English todaybinormal

From bi- + normal.

Etymology from Wiktionary, CC BY-SA 4.0.