/ Dictionary / Index T tubi-: Meaning and Definition of Find definitions for: tubi- Pronunciation: [key] a combining form representingin compound words: tubiform. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tubeworm tubifex Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language