isotropic

from WordNet (r) 3.0 (2006)

isotropic
    adj 1: invariant with respect to direction [syn: {isotropic},
           {isotropous}] [ant: {anisotropic}]

from The Collaborative International Dictionary of English v.0.48

Isotropic \I`so*trop"ic\, a. [Iso- + Gr. ? a turning, fr. ? to
   turn.] (Physics)
   Having the same properties in all directions; specifically,
   equally elastic in all directions.
   [1913 Webster]