평면 위의 두 정점으로부터의 거리의 합이 일정한 점들의 집합으로 이루어진 폐곡선.
A regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant.
예문:
"The Earth's orbit around the Sun is not a perfect circle but an ellipse."
"The artist drew an ellipse to represent the opening of the vase in perspective."
"A whispering gallery is often built in the shape of an ellipse so that sound from one focus travels to the other."