A shape that has a X, Y and Z axis. It has multiple faces and vertices so it looks like lots of two-dimensional shapes stuck together.
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An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
An egg-shaped, three-dimensional shape is an ovoid.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
It is a polyhedron.
The shape is an octagon.