Definition: The word "Tiresias" in Greek refers to an obscure historical figure who was said to have been a teacher of Pythagoras, an important philosopher and mathematician, during his days as a student at Athens. However, modern scholars argue that Tiresias is not actually a well-known historical figure but rather the name given to a legendary personification or character in the mythological tradition of ancient Greece. In this case, "Tiresias" could symbolize either the divine philosopher or the mysterious mythical figure who was said to have been a teacher of Pythagoras during his days as a student at Athens.