Math. [f. BI- pref.2 II + NORMAL.] (See quot.)
1848. Salmon, Analyt. Geom. (1865), § 353. The normal perpendicular to that [the osculating] plane … being normal to two consecutive elements of the curve, has been called by M. Saint-Venant the Binormal.
1857. Price, Infin. Calculus, I. 512. The former [line] has the distinctive name of binormal.
