Crossword Genius

Like natural logs not available from area of Mount Olympus (9)

Ross

I believe the answer is:

napierian

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'like' is the definition.
Both the answer and definition are adjectives.
Maybe you can see an association between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for napierian that I've seen is " like a log, naturally".)

I've seen this clue in The Sunday Times and The Times.
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