| unicursal | <geometry> That can be passed over in a single course; said of a curve when the coordinates of the point on the curve can be expressed as rational algebraic functions of a single parameter <theta/. As <theta/ varies minus infinity to plus infinity, to each value of <theta/ there corresponds one, and only one, point of the curve, while to each point on the curve there corresponds one, and only one, value of <theta/. Straight lines, conic sections, curves of the third order with a nodal point, curves of the fourth order with three double points, etc, are unicursal. Origin: Uni- + L. Currere, cursum, to run. Source: Websters Dictionary (01 Mar 1998) |
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