Hypertext Webster Gateway: "hyperboloid"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hyperboloid \Hy*per"bo*loid\, n. [Hyperbola + -oid: cf. F.
hyperbolo["i]de.] (Geom.)
A surface of the second order, which is cut by certain planes
in hyperbolas; also, the solid, bounded in part by such a
surface.
{Hyperboloid of revolution}, an hyperboloid described by an
hyperbola revolving about one of its axes. The surface has
two separate sheets when the axis of revolution is the
transverse axis, but only one when the axis of revolution
is the conjugate axis of the hyperbola.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hyperboloid \Hy*per"bo*loid\, a. (Geom.)
Having some property that belongs to an hyperboloid or
hyperbola.
From WordNet (r) 1.7 (wn)
hyperboloid
n : a quadric surface generated by rotating a hyperbola around
its main axis
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