Source : Webster's Revised Unabridged Dictionary (1913)

Logarithmic \Log`a*rith"mic\, Logarithmical \Log`a*rith"mic*al\,
   a. [Cf. F. logarithmique.]
   Of or pertaining to logarithms; consisting of logarithms.

   {Logarithmic curve} (Math.), a curve which, referred to a
      system of rectangular co["o]rdinate axes, is such that the
      ordinate of any point will be the logarithm of its
      abscissa.

   {Logarithmic spiral}, a spiral curve such that radii drawn
      from its pole or eye at equal angles with each other are
      in continual proportion. See {Spiral}.