Dictionary  hy•per•bo•laPronunciation: (hī-pûr'bu-lu), [key] —n. Geom. the set of points in a plane whose distances to two fixed points in the plane have a constant difference; a curve consisting of two distinct and similar branches, formed by the intersection of a plane with a right circular cone when the plane makes a greater angle with the base than does the generator of the cone. Equation: &hyperbola;. See diag. under conic section. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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