Polymath

Given that it is the birthday of renowned physician and scholar Peter Mark Roget, the word for today is polymath. A polymath is a person with a vast amount of knowledge or learning. Roget was a polymath because he did not only concern himself with being a medical doctor, but was also very knowledgeable about literature and language and invented the ever-useful thesaurus. Polymath comes from the Greek meaning "having learned much." Poly- meaning "much" and -math deriving from manthanein--"to learn."