Titan (ti·tan) noun
A titan is an extremely important person. Albert Einstein was a titan in the world of science. The noun titan comes from Greek mythology, in which the Titans were a race of gods. Today, a titan is someone who is god-like, or powerful and influential in a certain field.
1. capitalized : any of a family of giants in Greek mythology born of Uranus and Gaea and ruling the earth until overthrown by the Olympian gods
2. one that is gigantic in size or power : one that stands out for greatness of achievement