/ Dictionary / Index T test-fly: Meaning and Definition of Find definitions for: test-fly Pronunciation: (test'flī"), [key] — -flew, -flown, -fly•ing. to fly (an aircraft or spacecraft) for the evaluation of performance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: test-fly (Thesaurus) test flight testicle Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language