Pythagoras play biographical name Py·thag·o·ras \pə-ˈtha-gə-rəs, pī-\ Definition of Pythagoras ca 580–ca 500 b.c. Greek philos. & math. Rhymes with pythagoras Protagoras Learn More about pythagoras Britannica English: Translation of "Pythagoras" for Arabic speakers Britannica.com: Encyclopedia article about "Pythagoras" Seen and Heard What made you want to look up Pythagoras? Please tell us where you read or heard it (including the quote, if possible).