adjective Optics.
making a small angle with and lying close to the axis of an optical system: paraxial ray.

1860–65; par- + axial Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
paraxial (pæˈræksɪəl)
physics (of a light ray) parallel to the axis of an optical system

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

paraxial par·ax·i·al (pā-rāk'sē-əl)
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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