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optic axis

noun Crystallography.

(in a crystal exhibiting double refraction) the direction or directions, uniaxial or biaxial, respectively, along which this phenomenon does not occur.

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Origin:
1655–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Optic axis is always a great word to know.

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a scrap or morsel of food left at a meal.

a fool or simpleton; ninny.

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Collins

World English Dictionary

optic axis

—n
	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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

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

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