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1. Having the polar diameter greater than the equatorial diameter
   "a prolate spheroid is generated by revolving an ellipse about its major axis";
   - watermelon-shaped
    
2. Rounded like an egg
   "I think the prolate bodies may probably turn out to be eggs of some small animals";
   - egg-shaped, elliptic, elliptical, oval, oval-shaped, ovate, oviform, ovoid

See also: cucumber-shaped, rounded

Antonym: oblate

Encyclopedia: Prolate