binormal

[ bahy-nawr-muhl, bahy-nawr- ]

/ ˈbaɪˌnɔr məl, baɪˈnɔr- /

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noun Geometry.

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