The Collaborative International Dictionary of English v.0.48:

Curvate \Cur"vate\ (k?r"v?t), Curvated \Cur"va*ted\ (-v?-t?d),
   a. [L. curvatus p. p. of curvare to curve, fr. curvus. See
   Curve.]
   Bent in a regular form; curved.
   [1913 Webster]