/ Dictionary / Index T thorite: Meaning and Definition of Find definitions for: tho•rite Pronunciation: (thôr'īt, thōr'-), [key] — n. a rare mineral, thorium silicate, ThSiO, occurring in the form of yellow or black crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thorite (Thesaurus) thorianite thorium 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