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## hyperbolical |

1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Hyperbolic \Hy`per*bol"ic\, Hyperbolical \Hy`per*bol"ic*al\, a. [L. hyperbolicus Gr ?: cf F. hyperbolique.] 1. (Math.) Belonging to the hyperbola; having the nature of the hyperbola. 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.