logarithmal,a.rare.|lɒgəˈrɪθməl, -ɪð-| [f. logarithm + -al1.] = logarithmic. 1630R. Delamain GrammalogiaTo Rdr., To shadow out to the more learned the quintessence of this Logarythmall projection in Circles.1849Freese Comm. Class-bk. 90 By logarithmal numbers.