birefringence /baɪɹɪˈfɹɪnd͡ʒəns/ noun1 •The splitting of a ray of light into two parallel rays of perpendicular polarization by passage through an optically anisotropic medium; the property of a material that light passing through it is so split.In figure 6, the birefringence, δ, for 2H, 4H, 6H, and 15R is plotted as a function of wavelength. — 1972 formsbirefringences
