/ Dictionary / Index T tubulin: Meaning and Definition of Find definitions for: tu•bu•lin Pronunciation: (t'byu-lin, ty'-), [key] — n. Biochem. either of two globular proteins that form the structural subunits of microtubules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tubuliflorous tubulous Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language