/ Dictionary / Index A appal: Meaning and Definition of Find definitions for: ap•pal Pronunciation: (u-pôl'), [key] — -palled, -pal•ling. appall. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: appal (Thesaurus) app Appalachia Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language