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circle of least confusion

American  

noun

Optics.

  1. the smallest cross section in a beam of paraxial rays, lying in the plane of least spherical aberration.

Etymology

Origin of circle of least confusion

First recorded in 1865–70

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.