It comes from the Greek πολυμαθής, polymathēs, "having learned much" and describes a person who has expertise in a large number of different subjects, but more importantly, they are able to draw on this knowledge to solve problems. Science fiction author Robert Heinlein believed that everyone should attempt to be a polymath and that specialisation was for insects.
n. A plumber. So called because poop is the medium in which they work. A metalsmith works with metal, a poopsmith works with poop. See also ppopsmithery
A unique and talented individual who displays exceptional skill or expertise in many areas. Talent is mostly shown in the arts, but polymaths have been known to display gifts outside of this area, such as the sciences, etc. Polymaths are also largely individual and commonly self-taught.