spherical

Short definition from Wiktionary

Adjective

1. 1
   Shaped as a sphere; being a sphere.
2. 2
   Of, or pertaining to, spheres.
3. 3
   Of a coordinate system, specifying the location of a point in a plane by using a radius and two angles.
4. 4
   Of or relating to the heavenly orbs, or to the sphere or spheres in which, according to ancient astronomy and astrology, they were set.
5. 5
   Of a multivariate probability distribution, to have a covariance matrix equal to the identity matrix up to a multiplicative factor.