The Collaborative International Dictionary of English v.0.48:
Curve \Curve\, n. [See Curve, a., Cirb.]
1. A bending without angles; that which is bent; a flexure;
as, a curve in a railway or canal.
2. (Geom.) A line described according to some low, and having
no finite portion of it a straight line.
Axis of a curve. See under Axis.
Curve of quickest descent. See Brachystochrone.
Curve tracing (Math.), the process of determining the
shape, location, singular points, and other peculiarities
of a curve from its equation.
Plane curve (Geom.), a curve such that when a plane passes
through three points of the curve, it passes through all
the other points of the curve. Any other curve is called a
curve of double curvature, or a twisted curve.