大だい円えん

noun

large circle

General term for a circle of large size, not necessarily mathematical.

• グラウンドに大だい円えんを描えがく。

  Draw a large circle on the ground.

noun

great circle

Mathematical term: a circle on a sphere whose plane passes through the center of the sphere. Contrasts with 小円 (small circle).

See also: 小円

• 赤せき道どうは地ち球きゅうの大だい円えんの一ひとつである。

  The equator is one of the Earth's great circles.