Napierian

[ nuh-peer-ee-uh n ]

/ nəˈpɪər i ən /

of, relating to, or formulated by John Napier.

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First recorded in 1810–20; Napier + -ian

The logarithms are strictly Napierian, and the arrangement is identical with that in the canon of 1614.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 8|Various
The symbol e for the base of the Napierian logarithms was introduced by Euler .
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 5|Various
This is the largest Napierian canon that has ever been published.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 8|Various
There are two bases of logarithms in common use, the base 10 and the Napierian base e.
The New Gresham Encyclopedia|Various

Similarly the continued fraction given by Euler as equivalent to (e - 1) (e being the base of Napierian logarithms), viz.
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 2|Various