ellipsoid
/ɪˈlɪpsɔɪd/
noun
- A three-dimensional shape like a stretched or squashed sphere, where all cross-sections are ellipses or circles.
- The designer used an ellipsoid for the new building's dome.
- A rugby ball is shaped like an ellipsoid.
- The Earth is not a perfect sphere but an ellipsoid, slightly flattened at the poles.