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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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Nearby words

  1. circle jerk,
  2. circle of confusion,
  3. circle of convergence,
  4. circle of curvature,
  5. circle of declination,
  6. circle of willis,
  7. circle time,
  8. circle-in,
  9. circle-out,
  10. circlet

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