/ Dictionary / Index M mercury mass: Meaning and Definition of Find definitions for: mer'cury mass" Pronunciation: [key] See(def. 1). See(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mercury fulminate mercury sulfide Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language