/ Dictionary / Index E Eustace: Meaning and Definition of Find definitions for: Eus•tace Pronunciation: (y'stus), [key] — n. a male given name: from a Greek word meaning “steadfast.” Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. eusol Eustachian tube Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language