Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 Pythagoras fl. sixth century B.C. Greek philosopher who founded a school in southern Italy that sought to discover the mathematical principles of reality through the study of musical harmony and geometry. The Pythagorean theorem is ascribed to him.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 proper n. An Ancient Greek mathematician and philosopher
 proper n. Pythagoras' theorem.
 proper n. A male given name of mostly historical use, and a transliteration from modern Greek.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. Greek philosopher and mathematician who proved the Pythagorean theorem; considered to be the first true mathematician (circa 580500 BC)
Etymologies
Examples

Before the sixth century B.C. all the religiousphilosophical ideas of Pythagoras are current in India (L. von Schroeder, _Pythagoras_).
The Religions of India Handbooks on the History of Religions, Volume 1, Edited by Morris Jastrow

Â Pythagoras is aghast, reminding the boy that he is the man responsible for Cho’s parents dying, and that he can punish him today.
Review: Incredible Hercules #137  Major Spoilers  Comic Book Reviews and News

He may have been mathematically inclined, since he saddled one of his children with the name Pythagoras Wetmore.

He treated the epic poets as fools and called Pythagoras a fraud.

I regret not recalling Pythagoras' comment ''from the sample we can judge the whole''.

I recalled Pythagoras 'saying, which I had quoted to Chairemon so lightly.

Pythagoras, which is performed in the following manner.

If you have seen that, then do not repeat to me the old story of the beauty, glory and greatness of the human blade called Pythagoras, Caear or Napoleon.

He was at once given the franchise, but the question was still pending whether he was to be known as Pythagoras or Euphorbus.

You must know, Madam, that about a thousand Years ago I was an Indian Brachman, and versed in all those mysterious Secrets which your European Philosopher, called Pythagoras, is said to have learned from our Fraternity.
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