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1. (n.) optic axis
the direction or directions in a crystal along which light is not doubly refracted.
Etymology: (1655–65)
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| Definition of 'optic axis' |
Princeton's WordNet |
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1. (noun) optic axis
in a doubly refracting crystal, the line in the direction of which no double refraction occurs
"a crystal may have either one or two optic axes"
2. (noun) principal axis, optic axis
a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
"in a normal eye the optic axis is the direction in which objects are seen most distinctly"
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Definitions of optic axis 
