circle of least confusion
the smallest cross section in a beam of paraxial rays, lying in the plane of least spherical aberration.
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- circle jerk,
- circle of confusion,
- circle of convergence,
- circle of curvature,
- circle of declination,
- circle of willis,
- circle time,
Origin of circle of least confusion
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019