/ Dictionary / Index A aghast: Meaning and Definition of Find definitions for: a•ghast Pronunciation: (u-gast', u-gäst'), [key] — adj. struck with overwhelming shock or amazement; filled with sudden fright or horror: They stood aghast at the sight of the plane crashing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aghast (Thesaurus) agha AGI Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language