pol·y·math 
(pŏlē-măth′)
(pŏlē-măth′)n.
A person of great or varied learning.
[Greek polumathēs : polu-, poly- + manthanein, math-, to learn; see mendh- in the Appendix of Indo-European roots.]
poly·math′, pol′y·mathic adj.
po·lyma·thy (pə-lĭmə-thē) n.