The story
From New Latin logarithmus nātūrālis, coined in 1668 by Nicholas Mercator in his book Logarithmo-technica.
Etymology from Wiktionary, CC BY-SA 4.0.
natural logarithm
Today it means: The logarithm in base e: either the function that given x returns y such that eʸ = x, or the value of y given by the function. Full definition →