polymath (noun) – a person with extraordinarily comprehensive knowledge across several fields of study [pol-ee-math]
BREAKDOWN: POLY- (more than one) + MATH- (learning)
polymathy is possession of expansive or encyclopedic knowledge
polyhistor is another word for polymath
See also: hyperpolyglot
“You could give Aristotle a tutorial. And you could thrill him to the core of his being. Aristotle was an encyclopedic polymath, an all time intellect. Yet not only can you know more than him about the world. You also can have a deeper understanding of how everything works. Such is the privilege of living after Newton, Darwin, Einstein, Planck, Watson, Crick and their colleagues.” —Richard Dawkins
Another great word. And the number of self-described polymaths is quite high, I reckon.