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binormal

[bahy-nawr-muh l, bahy-nawr-] /ˈbaɪˌnɔr məl, baɪˈnɔr-/
noun, Geometry
1.
the normal to a curve, lying perpendicular to the osculating plane at a given point on the curve.
Origin
1840-1850
1840-50; bi-1 + normal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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