/ Dictionary / Index T three-speed: Meaning and Definition of Find definitions for: three-speed Pronunciation: (thrē'spēd"), [key] — n. a system of gears having three forward gear ratios, esp. on a bicycle. a bicycle having such a system of gears. —adj. having three forward gear ratios. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. threesome threespine stickleback Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language