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paraxial

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WordReference Random House Unabridged Dictionary of American English © 2026

par•ax•i•al adj. [Optics.]

Opticsmaking a small angle with and lying close to the axis of an optical system:paraxial ray.

par- + axial 1860–65

'paraxial' also found in these entries (note: many are not synonyms or translations):

Gaussian image - circle of least confusion

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