/ Dictionary / Index S STD: Meaning and Definition of Find definitions for: STD Pronunciation: [key] sexually transmitted disease. std. Pronunciation: [key] standard. S.T.D. Pronunciation: [key] Doctor of Sacred Theology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: std (Thesaurus) St. Cyr-l'École St. Denis Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language