sphærical

Adjective

spherical (comparative more spherical, superlative most spherical)

1. Shaped as a sphere; being a sphere.
   • The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist

   Synonyms:

   spheric, spheral, globular, orbicular, round

2. (not comparable) Of, or pertaining to, spheres.
3. Of a coordinate system, specifying the location of a point in a plane by using a radius and two angles.
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.
   • Knaves, thieves, and treachers by spherical predominance.c. 1603–1606, William Shakespeare, “The Tragedie of King Lear”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount...
5. Of a multivariate probability distribution, to have a covariance matrix equal to the identity matrix up to a multiplicative factor.
   • a spherical Gaussian distribution