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paraxial

[par-ak-see-uh l] /pærˈæk si əl/
adjective, Optics.
1.
making a small angle with and lying close to the axis of an optical system:
paraxial ray.
Origin
1860-1865
1860-65; par- + axial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for par-axial

paraxial

/pæˈræksɪəl/
adjective
1.
(physics) (of a light ray) parallel to the axis of an optical system
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
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par-axial in Medicine

paraxial par·ax·i·al (pā-rāk'sē-əl)
adj.
Located alongside of the axis of a body or part.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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