Optic-axis



noun, Crystallography.
1.
(in a crystal exhibiting double refraction) the direction or directions, uniaxial or biaxial, respectively, along which this phenomenon does not occur.
noun
1.
the direction in a uniaxial crystal or one of the two directions in a biaxial crystal along which a ray of unpolarized light may pass without undergoing double refraction

optic axis n.
The line connecting the anterior and the posterior poles of the eye.

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