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Biaxial crystals

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Biaxial crystals

(Science: microscopy) anisotropic crystals in the orthorhombic, monoclinic and triclinic systems. They have three principal refractive indices alpha, beta, and gamma, and two isotropic directions, i.e., optic axes. Bifilar eyepiece. An ocular with two crossed hairs, wires, filaments or threads each of which has perpendicular motion.