follow Dictionary.com

Why is the ninth month called September?

circle of least confusion

noun, Optics.
1.
the smallest cross section in a beam of paraxial rays, lying in the plane of least spherical aberration.
Origin
1865-1870
1865-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source

Word of the Day

Difficulty index for circle of least confusion

Few English speakers likely know this word

Word Value for circle

10
13
Scrabble Words With Friends