Polymath

[ from Dictionary.com Word of the Day,
http://dictionary.reference.com/wordoftheday ]

polymath \POL-ee-math\, noun:

A person of great or varied learning; one acquainted with various
subjects of study.

A century after Aristotle, in 240 B.C., a brilliant polymath,
Eratosthenes, is appointed chief librarian of the Museum at
Alexandria--the most cosmopolitan city and center of learning in the
Mediterranean world.
-- Alan Gurney, Below the Convergence
<http://www.amazon.com/exec/obidos/ASIN/0393039498/ref=nosim/lexico>

Alan Kay, for instance, one of the wizards of PARC and now an Apple
fellow, is a polymath accomplished in math, biology, music,
developmental psychology, philosophy, and several other disciplines.
-- Warren Bennis and Patricia Ward Biederman, Organizing Genius
<http://www.amazon.com/exec/obidos/ASIN/0201339897/ref=nosim/lexico>

Like her literary heroine, George Eliot, Kingsolver is an old-fashioned
polymath, curious about all branches of human learning.
-- Sarah Kerr, "The Novel As Indictment", New York Times
<http://www.nytimes.com/> , October 11, 1998

Polymath is from Greek polymathes, "having learned much," from poly-,
"much" + manthanein, "to learn."