A semi-ellipsoid.
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A 3d oval is called an ovoid. Egg would work as well
In science, a three-dimensional oval is called an ovoid. Less formally, a three-dimensional oval shape is called an egg.
Ellipsoid. (An oval is a 2-d shape, NOT 3-d).
Half of the height times half of the width time pi (3.1415926535897)
a pyramid is 3d