hyperbola
/haɪˈpɜːbələ/noun
(pl. hyperbolas 或hyperbolae /-liː/)
1- a symmetrical open curve formed by the intersection of a cone with a plane at a smaller angle with its axis than the side of the cone双曲线。
1.1
- Mathematics the pair of such curves formed by the intersection of a plane with two equal cones on opposite sides of the same vertex【数】双曲线。
词源
mid 17th cent.: modern Latin, from Greek huperbolē 'excess' （from huper 'above'+ballein 'to throw'）.