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It is called an oval - which is not the same as an ellipse.
The shape of a flattened circle is called an ellipse. The shape is similar to an oval and some may mistakenly call it an oval.
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.
Half an oval is called a semicircle. It's like an oval that got cut in half, so now it's just half the fun. But hey, at least it's still technically correct!
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