circle of least confusion

noun Optics.

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

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019