/ Dictionary / Index G Guillaume: Meaning and Definition of Find definitions for: Guil•laume Pronunciation: (Fr. gē-yōm'), [key] 1861–1938, Swiss physicist: Nobel prize 1920. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Guillain-Barré syndrome Guillaume de Machaut Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language