a. and sb. Math. [f. Steiner (see below) + -IAN.] a. adj. Pertaining to the discoveries of Jakob Steiner, a German Swiss geometer. Steinerian polygon, a figure composed of a number of vertices with connecting lines. b. sb. The locus of points whose first polars with respect to a given curve have double points.
1873. Salmon, Higher Plane Curves (1879), 57. This locus we shall call after the geometer Steiner, the Steinerian of U. Ibid., 363. To any point P, then, on the Steinerian corresponds a point Q on the Hessian.
