'Pythagorean letter' definitions:

Definition of 'Pythagorean letter'

From: GCIDE
  • Pythagorean \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. [1913 Webster]
  • The central thought of the Pythagorean philosophy is the idea of number, the recognition of the numerical and mathematical relations of things. --Encyc. Brit. [1913 Webster]
  • 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. [1913 Webster]