a. Math. Also contangential. [f. CO-, CON- + TANGENTIAL.] Having the same tangent.
1879. Thomson & Tait, Nat. Phil., I. I. § 130. A line of curvature of a surface is a line which at every point is cotangential with normal section of maximum or minimum curvature.
1886. London Math. Soc. Proc., XVIII. 2. On … Contangential and Coaxal Spherical Circles: Mr. Jeffery.
