/ Dictionary / Index T Tu: Meaning and Definition of Find definitions for: Tu Pronunciation: [key] — Chem. Chem. (formerly) thulium. Tu. Pronunciation: [key] Tuesday. T.U. Pronunciation: [key] toxic unit. Trade Union. Training Unit. t.u. Pronunciation: [key] trade union. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. TTY Tuamotu Archipelago Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language