oblate spheroid
rotationally symmetric ellipsoid having a polar axis shorter than the diameter of the equatorial circle whose plane bisects it
en-US/ˈɑbleɪt ˈsfiɹɔɪd/
en-GB/ˈɒbleɪt ˈsfɪəɹɔɪd/
rotationally symmetric ellipsoid having a polar axis shorter than the diameter of the equatorial circle whose plane bisects it