/ Dictionary / Index T tuba: Meaning and Definition of Find definitions for: tu•ba Pronunciation: (t'bu, ty'-), [key] — pl. -bas -bae a valved, brass wind instrument having a low range. an organ reed stop of large scale with tones of exceptional power. an ancient Roman trumpet. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tuba (Thesaurus) tub tubal 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