• (a.) Of or pertaining to logarithms; consisting of logarithms.

Found on http://thinkexist.com/dictionary/meaning/logarithmical/

Of or pertaining to logarithms; consisting of logarithms. ... <mathematics> Logarithmic curve, a curve which, referred to a system of rectangular coordinate 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...

Found on http://www.encyclo.co.uk/local/20973

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