/ 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: wizened Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language