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.

Origin of optic axis

First recorded in 1655–65
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British Dictionary definitions for optic axis

optic axis

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

optic axis in Medicine

optic axis

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