bi normal

bi·nor·mal

[bahy-nawr-muhl, bahy-nawr-]
noun Geometry.
the normal to a curve, lying perpendicular to the osculating plane at a given point on the curve.

Origin:
1840–50; bi-1 + normal

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Bi normal is always a great word to know.
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a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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