\Pyth`a*go"re*an\, a. [L. Pythagoreus, Gr. ?.]
Of or pertaining to Pythagoras (a Greek philosopher, born
about 582 b. c.), or his philosophy.
      The central thought of the Pythagorean philosophy is
      the idea of number, the recognition of the numerical
      and mathematical relations of things.    --Encyc. Brit.
{Pythagorean proposition} (Geom.), the theorem that the
   square described upon the hypothenuse of a plane
   right-angled triangle is equal to the sum of the squares
   described upon the other two sides.
{Pythagorean system} (Astron.), the commonly received system
   of astronomy, first taught by Pythagoras, and afterward
   revived by Copernicus, whence it is also called the
   {Copernican system}.
{Pythagorean letter}. See {Y.}

\Pyth`a*go"re*an\, n.
A follower of Pythagoras; one of the school of philosophers
founded by Pythagoras.