polymath
Concise Oxford English Dictionary © 2008 Oxford University Press:
polymath /ˈpɒlɪmaθ/
▶noun a person of wide-ranging knowledge or learning.
– derivatives
polymathic adjective,
polymathy /pəˈlɪməθi/ noun.
polymathic adjective,
polymathy /pəˈlɪməθi/ noun.
– origin C17: from Gk polumathēs ‘having learned much’.
'polymath' also found in these Oxford entries:

