prolate spheroid
rotationally symmetric ellipsoid having a polar axis longer than the diameter of the equatorial circle whose plane bisects it
en-GB/pɹəʊleɪt ˈsfɪəɹɔɪd/
en-US/ˈpɹoʊleɪt ˈsfiɹɔɪd/
rotationally symmetric ellipsoid having a polar axis longer than the diameter of the equatorial circle whose plane bisects it