/ Dictionary / Index T tungsten trioxide: Meaning and Definition of Find definitions for: tung'sten triox'ide Pronunciation: [key] — Chem. Chem. a heavy, canary-yellow, water-insoluble powder, WO, used in the manufacture of tungstates. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tungsten steel tungstic Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language