[par-ak-see-uh l] /pærˈæk si əl/

adjective, Optics.
making a small angle with and lying close to the axis of an optical system:
paraxial ray.
(physics) (of a light ray) parallel to the axis of an optical system

paraxial par·ax·i·al (pā-rāk’sē-əl)
Located alongside of the axis of a body or part.


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