Word Origin & History
Pythagorean
1550, from L. Pythagoreus "of or pertaining to Pythagoras," Gk. philosopher of Samos (6c. B.C.E.), whose teachings included transmigration of the soul and vegetarianism (these are some of the commonest early allusions in Eng.). The Pythagorean theorem is the 47th of the first book of Euclid.