Lŏg'a-rith'mic or Lŏg'a-rith'mic-al, a.

a. [Fr. logarithmique, Sp. & It. logaritmico.] Pertaining to logarithms; consisting of logarithms.

Logarithmic curve (Math.), a curve which, referred to a system of rectangular co-ordinate 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, as the projection of the rhumb line on the plane of the equator.