{ } a. [ Gr. &unr_; unequal + &unr_; a turning, &unr_; to turn. ] (Physics) Not isotropic; having different properties in different directions; thus, crystals of the isometric system are optically isotropic, but all other crystals are anisotropic. [ 1913 Webster ]
a. [ Iso- + Gr. &unr_; a turning, fr. &unr_; to turn. ] (Physics) Having the same properties in all directions; specifically, equally elastic in all directions. [ 1913 Webster ]