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.

QUIZ

ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?

We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.

Question 1 of 8

Which of the following words describes “sky blue”?

navy

beryl

azure

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Origin of binormal

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

Words nearby binormal

binomial experiment, binomial nomenclature, binomial series, binomial theorem, binominal, binormal, binotic, binovular, binoxalate, bins, Binswanger's disease