1. A three-dimensional object that is shaped like a sphere, but is not perfectly round; such as, an ellipsoid or a geometric surface or a solid figure shaped like an oval.
2. Having a shape that is approximately spherical.
3. Any globular body, or one resembling a sphere.
4. An ellipsoid (a geometric surface or a solid figure shaped like an oval) generated by the rotation of an ellipse (a two-dimensional shape like a stretched circle with slightly longer flatter sides) around one of its axes or a straight line around which a geometric figure or a three-dimensional object is symmetrical.

A type of synovial joint; such as, that of the hip or shoulder, in which the rounded head of one bone lodges in a concave surface on the other bone; a ball-and-socket joint.