a. and sb. Math. [f. CO- 2 + RESIDUAL.] (See quot.)
1873. Salmon, Higher Plane Curves, v. (1879), 134. If any conic be described through four fixed points on a cubic, the chord joining the two remaining intersections of the conic with the cubic will pass through a fixed point on the cubic…. This point … is called the coresidual of the system of four points…. Two points which are coresidual must coincide.
