/ Dictionary / Index F flaps: Meaning and Definition of Find definitions for: flaps Pronunciation: (flaps), [key] — n. (used with a sing. v.) Vet. Pathol. swelling of the lips of a horse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: flaps (Thesaurus) flappy flap valve Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language