名詞 hyperbola:

1. an open curve formed by a plane that cuts the base of a right circular cone

hy.per.bo.la

n.（名詞）
【復數(shù)】 hy.per.bo.las 或 hy.per.bo.lae [-lô] 【數(shù)學】
A plane curve having two branches, formed by the intersection of a plane with both halves of a right circular cone at an angle parallel to the axis of the cone. It is the locus of points for which the difference of the distances from two given points is a constant.
雙曲線：有兩條分支的一個平面曲線，由一個平面與一個直立的圓錐以與錐的中軸相平行的角度相切而成，它是切點的軌跡，在這個軌跡上任何點與給定的兩點之間的距離變化是個常數(shù)

來源：
New Latin
現(xiàn)代拉丁語
from Greek huperbolô [a throwing beyond, excess (from the relationship between the line joining the vertices of a conic and the line through its focus and parallel to its directrix)] * see hyperbole
源自 希臘語 huperbolô [向上拋線，超過（從連結二次曲線頂點的線和通過其中心亦與線平行的線之間的關系）] *參見 hyperbole