subsecant
/ˈsʌbsiːk(ə)nt/Mathematics. Now rare
noun
In Cartesian coordinates: the part of the x-axis lying between the two points where it is cut by a secant of a curve and by a perpendicular drawn from the point where the secant cuts the curve to the x-axis.
Origin
Mid 18th century; earliest use found in George Berkeley (1685–1753), Church of Ireland bishop of Cloyne and philosopher. From sub- + secant.