noun
small circle
General term for any small circle, not necessarily mathematical.
紙に小円をいくつか描いた。
I drew several small circles on the paper.
noun
small circle (of a sphere)
In geometry, a circle on a sphere whose plane does not pass through the center; contrast with 大円 (great circle).
See also: 大円
球面上の小円は、大円より曲率が大きい。
A small circle on a sphere has greater curvature than a great circle.