philomath \FY-luh-math\, noun:
A lover of learning; a scholar.
It is precisely for the philomaths that universities ought to cater.
--Aldous Huxley, Proper Studies
The aged philomath might have been the original of the legendary mathematician.
--John Doran, A Lady of the Last Century
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Philomath is from the Greek philomathes, loving knowledge, from philos, loving, fond + mathein, to learn, to understand.