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