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paraxial

[ par-ak-see-uhl ]

adjective

, Optics.
  1. making a small angle with and lying close to the axis of an optical system:

    paraxial ray.



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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Word History and Origins

Origin of paraxial1

First recorded in 1860–65; par- + axial

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