/ Dictionary / Index M mercaptide: Meaning and Definition of Find definitions for: mer•cap•tide Pronunciation: (mur-kap'tīd), [key] — n. Chem. a metallic salt of a mercaptan. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mercaptan mercapto Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language