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- Dictionaryspheroid/ˈsfɪərɔɪd/
noun
- 1. a sphere-like but not perfectly spherical body.
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noun
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Volume formed by rotating an ellipse around one of its axes; special case of ellipsoid
A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. A spheroid has circular symmetry. Wikipedia