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binormal

[bahy-nawr-muh l, bahy-nawr-]

noun Geometry.

the normal to a curve, lying perpendicular to the osculating plane at a given point on the curve.

Origin of binormal

First recorded in 1840–50; bi-¹ + normal

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019