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单词 ellipse
释义

WordReference Random House Learner's Dictionary of American English © 2024
el•lipse /ɪˈlɪps/USA pronunciation   n. [countable]
  1. Mathematicsa plane curve figure shaped like a flattened circle or oval.

WordReference Random House Unabridged Dictionary of American English © 2024
el•lipse  (i lips′),USA pronunciation n. [Geom.]
  1. Mathematicsa plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. Typical equation: (x2/a2) + (y2/b2) = 1. If a = b the ellipse is a circle. See diag. under conic section. 
  • Latin ellīpsis ellipsis; or by back formation from the plural ellipses
  • French
  • 1745–55

Collins Concise English Dictionary © HarperCollins Publishers::
ellipse /ɪˈlɪps/ n
  1. a closed conic section shaped like a flattened circle and formed by an inclined plane that does not cut the base of the cone. Standard equation x²/a² + y²/b² = 1, where 2a and 2b are the lengths of the major and minor axes. Area: πab
Etymology: 18th Century: back formation from ellipsis
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更新时间：2025/7/23 17:21:08