/ Dictionary / Index G gast: Meaning and Definition of Find definitions for: gast Pronunciation: (gast), [key] — v.t. Obs. to terrify or frighten. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gassy gas tank Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language