sphericity

from WordNet (r) 3.0 (2006)

sphericity
    n 1: the roundness of a 3-dimensional object [syn: {sphericity},
         {sphericalness}, {globosity}, {globularness}, {rotundity},
         {rotundness}]

from The Collaborative International Dictionary of English v.0.48

Sphericity \Sphe*ric"i*ty\, n. [Cf. F. sph['e]ricit['e].]
   The quality or state of being spherial; roundness; as, the
   sphericity of the planets, or of a drop of water.
   [1913 Webster]