Hyperbolic logarithm


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See Logarithm.
a logarithm (devised by John Speidell, 1619) of which the base is e (2.718281828459045...); - so called from Napier, the inventor of logarithms.

See also: Hyperbolic, Logarithm

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.