(tuǒ) ellipse
(tuǒyuán) oval; ellipse; elliptic
(tuǒyuánhánshù) (math.) elliptic function
(tuǒyuánxíng) oval
(tuǒyuánxíngbàngōngshì) Oval office (in the White House)
(tuǒyuánqūxiàn) (math.) elliptic curve
(tuǒyuánjī) elliptical machine (exercise)
(tuǒyuánjīfēn) (math.) elliptic integral