hyperboloid

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hyperboloid

[hī′pər·bə‚lȯid]
(mathematics)
A quadric surface given by an equation of the form (x 2/ a 2) ± (y 2/ b 2) - (z 2/ c 2) = 1; in certain cases it is a hyperboloid of revolution, which can be realized by rotating the pieces of a hyperbola about an appropriate axis.