/ Dictionary / Index I intestinal fortitude: Meaning and Definition of Find definitions for: intes'tinal for'titude Pronunciation: [key] courage; resoluteness; endurance; guts: to have intestinal fortitude. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. intestinal flu intestine Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language