Medical term:

paraxial



par·ax·i·al

(par-ak'sē-ăl),
By the side of the axis of any body or part.
Farlex Partner Medical Dictionary © Farlex 2012

par·ax·i·al

(par-ak'sē-ăl)
By the side of the axis of any body or part.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

paraxial 

Pertains to light rays situated near enough to the axis of an optical system for the gaussian theory to apply. See gaussian theory.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann


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