/ Dictionary / Index G gnat: Meaning and Definition of Find definitions for: gnat Pronunciation: (nat), [key] — n. any of certain small flies, esp. the biting gnats or punkies of the family Ceratopogonidae, the midges of the family Chironomidae, and the black flies of the family Simuliidae. mosquito. to fuss about trifles while ignoring more serious matters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gnat (Thesaurus) gnash gnatcatcher 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