paraxial

par·ax·i·al

[par-ak-see-uhl]
adjective Optics.
making a small angle with and lying close to the axis of an optical system: paraxial ray.

Origin:
1860–65; par- + axial

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Collins
World English Dictionary
paraxial (pæˈræksɪəl) [Click for IPA pronunciation guide]
 
adj
physics (of a light ray) parallel to the axis of an optical system

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Paraxial is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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