Ball, globe, sphere. Degree of approximation to a true sphere.
a solid that is bounded by a surface consisting of all points at a given distance from a point constituting its center,
the bounding surface of a sphere.
"Macvicar's illustrations of assimilation "Attraction, inertia, elasticity, heredity, reversion, symmetry, culminating in sphericity or symmetrical cellularity, chemical and electrical action, especially in voltaic action the influence and persistence of this law is most remarkably displayed." [JOHN ERNST WORRELL KEELY]