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]

The Collaborative International Dictionary of English v.0.48:

Prolate \Pro*late"\, v. t.
   To utter; to pronounce. [Obs.] "Foun-der-ed; prolate it
   right." --B. Jonson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prolate
    adj 1: having the polar diameter greater than the equatorial
           diameter; "a prolate spheroid is generated by revolving
           an ellipse about its major axis" [syn: prolate,
           watermelon-shaped] [ant: oblate, pumpkin-shaped]
    2: rounded like an egg [syn: egg-shaped, elliptic,
       elliptical, oval, oval-shaped, ovate, oviform,
       ovoid, prolate]