Archaic; bent or formed into a curve

In geometry, the locus of a point moving according to specified conditions. The circle is the locus of all points equidistant from a given point (the center). Other common geometrical curves are the ellipse, parabola, and hyperbola, which are also produced when a cone is cut by a plane at different angles.
Many curves have been invented for the solution of special problems in geometry and mechanics—for example, the cissoid (the inverse of a parabola) and the cycloid.
1. A baseball thrown with spin so that its path curves as it approach the batter; SYN. curve ball, breaking ball, bender.
2. A line on a graph representing data.
3. The trace of a point whose direction of motion changes; SYN. curved shape.

Tto have or take a turn, change, or deviation from a straight line or plane surface without sharp breaks or angularity
1. To cause to curve
2. To throw a curveball to (a batter)
3. To grade (as an examination) on a curve