/ Dictionary / Index S STM: Meaning and Definition of Find definitions for: STM Pronunciation: [key] scanning tunneling microscope. S.T.M. Pronunciation: [key] Master of Sacred Theology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: stm (Thesaurus) St. Lucie cherry St. Malo Related Content Daily Word Quiz: menagerie Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language