/ Dictionary / Index F fab: Meaning and Definition of Find definitions for: fab Pronunciation: (fab), [key] — adj. Slang. fabulous (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fab (Thesaurus) F.A.A.A.S. fabaceous Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language