The Collaborative International Dictionary of English v.0.48:

Prolate \Pro"late\, a. [L. prolatus, used as p. p. of proferre
   to bring forth, to extend; pro + latus, p. p. See Pro-, and
   Tolerate. ]
   Stretched out; extended; especially, elongated in the
   direction of a line joining the poles; as, a prolate
   spheroid; -- opposed to oblate.
   [1913 Webster]

   Prolate cycloid. See the Note under Cycloid.

   Prolate ellipsoid or Prolate spheroid (Geom.), a figure
      generated by the revolution of an ellipse about its major
      axis. Contrasted with oblate spheroid. See Ellipsoid of
      revolution, under Ellipsoid.
      [1913 Webster]

WordNet (r) 3.0 (2006):

prolate cycloid
    n 1: a cycloid generated by a point outside the rolling circle