An oblate spheroid is a sphere that is slightly flattened so that it is not perfectly spherical. Rotating planets, for example, are generally of this shape. The centrifugal force of the rotation causes the equatorial region to bulge out slightly.
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Spherical is round where oblate spheroid is more like a oval shape
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An oblate spheroid.
An oblate spheroid.
A three dimensional oval is simply called an egg, or more mathematically, an ovoid. A three dimensional ellipse (a more symmetric oval) is called a prolate spheroid, or oblate spheroid, depending on how the ellipse is rotated.