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• a  having the polar diameter greater than the equatorial diameter
  a prolate spheroid is generated by revolving an ellipse about its major axis
• s  rounded like an egg

• When it is not spinning, the sphere is not exactly spherical; it is slightly prolate (lemon-shaped), with its equatorial radius (where the metal is thickest) .

• watermelon-shaped
• egg-shaped
• elliptic
• elliptical
• oval
• oval-shaped
• ovate
• oviform
• ovoid

• oblate

News & Articles

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• Drivers compete in stock car races at Auto City Speedway
  CLIO — People packed the stands, nearly filling every seat as they arrived to watch stock car racing at Auto City Speedway on Thursday night in Clio. Aaron Pierce finished in first place in the Xtreme sprint feature, while Norm Davis won the ProLate model feature. Tiger Auto Salvage Street Stock cars and Virtual Hornets also competed.
  July 4, 2013 - The Flint Journal

Quotes

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• John Heisman in Spartanburg Herald Journal (subscription)
  Answering his own question, Heisman said: "It is a prolate spheroid in which the outer leather casing is drawn tightly over a somewhat smaller rubber tubing."