Ellipse



GRE

解释

GRE 红宝书

• n.椭圆 ( 形)
• ［英］ n.椭圆 ( 形) ( oval)
• ［记］ el+lipse ( 离开) -> 离开中心 -> 不圆 -> 椭圆

Webster Collegiate

noun

• Etymology: Greek elleipsis
• Date: circa 1753
• 1.
  • a. oval
  • b. a closed plane curve generated by a point moving in such a way that the sums of its distances from two fixed points is a constant ; a plane section of a right circular cone that is a closed curve
• 2. ellipsis

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