What common geometric term describes Saturn's flattened shape?

Saturn’s flattened shape is commonly described as an oblate spheroid.

“Oblate” means flattened at the poles and wider around the equator. Saturn’s rapid rotation produces centrifugal effects that counteract gravity more strongly at the equator, creating its noticeable bulge. It is the most visibly oblate planet in the Solar System.

The term is not interchangeable with “prolate spheroid,” which describes a shape stretched along its rotational axis, like a rugby ball. Nor is Saturn a perfect sphere: its equatorial radius is more than 10% greater than its polar radius. “Ellipsoid” is a broader mathematical description, while “oblate spheroid” identifies the specific rotational form.

Saturn’s low density, fluid-like interior also allows its shape to respond readily to rotation. Jupiter, Uranus, and Neptune are oblate as well, but Saturn’s combination of rapid rotation and internal structure makes its flattening especially pronounced.