circle of confusion
a circular spot on a film, resulting from the degree to which a pencil of light reflected from the field of view is focused in front of or behind the film, or from aberration of the lens, or from both.
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- circle absorption anesthesia,
- circle graph,
- circle jerk,
- circle of convergence,
- circle of curvature,
- circle of declination,
- circle of least confusion,
- circle of willis
Origin of circle of confusion
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019