circle of least confusion

noun Optics.

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

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anchorite
a granular metamorphic rock.
a person who has retired to a solitary place for a life of religious seclusion.
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Origin of circle of least confusion

First recorded in 1865–70

Words nearby circle of least confusion

circle jerk, circle of confusion, circle of convergence, circle of curvature, circle of declination, circle of least confusion, circle of willis, circle time, circle-in, circle-out, circlet
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020