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paraxial

[par-ak-see-uh l]
adjective Optics.
  1. 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. 2018

British Dictionary definitions for paraxial

paraxial

adjective
  1. physics (of a light ray) parallel to the axis of an optical system
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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

paraxial in Medicine

paraxial

(pă-răksē-əl)
adj.
  1. Located alongside of the axis of a body or part.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.