binormal

 [bahy-nawr-muhl, bahy-nawr-]  

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Binormal is always a great word to know.
So is quincunx. Does it mean:
a scrap or morsel of food left at a meal.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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