/ Dictionary / Index G gastr-: Meaning and Definition of Find definitions for: gastr- Pronunciation: [key] var. ofbefore a vowel: gastrectomy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Gastonia gastralgia Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language