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A body that is shaped like a sphere but is not perfectly round, especially an ellipsoid that is generated by revolving an ellipse around one of its axes.
sphe·roi′dal (sfĭ-roid′l), sphe·roi′dic (-roi′dĭk) adj.
sphe′roi·dic′i·ty (-dĭs′ĭ-tē) n.
1. (Mathematics) shaped like an ellipsoid of revolution; approximately spherical
2. (Mathematics) of or relating to an ellipsoid of revolution
spheˈroidally, spheˈroidically adv