uniaxial
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U`ni*ax"i*al, a. Etym: [Uni + axial.] 1. (Crystallog.) Defn: Having but one optic axis, or line of no double refraction. Note: In uniaxial crystals, the optic axis has the direction of the vertical crystallographic axis. All tetragonal and hexagonal crystals are uniaxial. 2. (Biol.) Defn: Having only one axis; developing along a single line or plane; -- opposed to multiaxial.