2. (Rhet.) Relating to, containing, or of the nature of,
hyperbole; exaggerating or diminishing beyond the fact;
exceeding the truth; as, an hyperbolical expression.
``This hyperbolical epitaph.'' --Fuller.
{Hyperbolic functions} (Math.), certain functions which have
relations to the hyperbola corresponding to those which
sines, cosines, tangents, etc., have to the circle; and
hence, called {hyperbolic sines}, {hyperbolic cosines},
etc.
{Hyperbolic logarithm}. See {Logarithm}.
{Hyperbolic spiral} (Math.), a spiral curve, the law of which
is, that the distance from the pole to the generating
point varies inversely as the angle swept over by the
radius vector.