/ Dictionary / Index S SMD: Meaning and Definition of Find definitions for: SMD Pronunciation: [key] senile macular degeneration. S.M.D. Pronunciation: [key] Doctor of Sacred Music. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sm. c. smear Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language