hyperbola
noun
hy·per·bo·la
hī-ˈpər-bə-lə
plural hyperbolas or hyperbolae
hī-ˈpər-bə-(ˌ)lē
: a plane curve generated by a point so moving that the difference of the distances from two fixed points is a constant : a curve formed by the intersection of a double right circular cone with a plane that cuts both halves of the cone
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Merriam-Webster unabridged
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