a. [mod. f. Gr. ἄνισος unequal + τροπικός belonging to turning, f. τρόπος a turning.] Acting in different ways on the ray of polarized light; possessing the power both of right- and left-handed polarization; æolotropic.
1879. Rutley, Stud. Rocks, ix. 77. Minerals … which exhibit double refraction or are anisotropic.
1881. Maxwell, Electr. & Magn., I. 137. A heterogeneous anisotropic medium.
