椭圆积分 tuǒyuánjīfēn elliptic integral Origin Definitions Defs Strokes Stroke Words Sentences Sents 椭圆 橢圓 tuǒyuán noun ellipse (math.) the locus of a point such that the sum of its distances from two fixed points is constant积分 積分 jīfēn noun integral (math) the result of a mathematical integration or the process of integration in calculus