paraxial

[ par-ak-see-uhl ]
/ pærˈæk si əl /

adjective Optics.

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

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Origin of paraxial

First recorded in 1860–65; par- + axial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for paraxial

paraxial
/ (pæˈræksɪəl) /

adjective

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

Medical definitions for paraxial

paraxial
[ pă-răksē-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.