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binormal

[bahy-nawr-muh l, bahy-nawr-]
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noun Geometry.
  1. the normal to a curve, lying perpendicular to the osculating plane at a given point on the curve.
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Origin of binormal

First recorded in 1840–50; bi-1 + normal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018