Py‧thag‧o‧ras /paɪˈθæɡərəs $ pə-/
(?582-?507BC) a Greek philosopher and mathematician, known for Pythagoras' Theorem, a way of calculating the length of one side of a triangle which has one angle of 90°, when you already know the length of the other two sides

[TahlilGaran] Dictionary of Contemporary English ▲