/ Dictionary / Index T Thr: Meaning and Definition of Find definitions for: Thr Pronunciation: [key] — Biochem. Biochem. threonine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thousandth Thrace Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language