/ Dictionary / Index P Pythagorean theorem: Meaning and Definition of Find definitions for: Pythag'ore'an the'orem Pronunciation: [key] — Geom. Geom. the theorem that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pythagorean scale Pythia Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language