/ Dictionary / Index T tubifex: Meaning and Definition of Find definitions for: tu•bi•fex Pronunciation: (t'bu-feks", ty'-), [key] — pl. -fex•es, -fex. any common, bottom-dwelling worm of the genus Tubifex, often used as food for aquarium fish. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tubi- tubiflorous 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