An Etymological Dictionary of Astronomy and Astrophysics
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Characteristic of optical analyses that are limited to infinitesimally small apertures. Also called first-order or Gaussian optics.

→ para-; → axial.

From par(â)-, → para-, + âseyi→ axial.

A ray that lies close to and almost parallel to the optical axis and behaves according to paraxial equations.

→ paraxial, → ray.