/ Dictionary / Index T t.d.s.: Meaning and Definition of Find definitions for: t.d.s. Pronunciation: [key] (in prescriptions) to be taken three times a day. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. TDRS TDY Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language