/ Dictionary / Index R red mercuric oxide: Meaning and Definition of Find definitions for: red' mercu'ric ox'ide. Pronunciation: [key] See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. red meat red mercuric sulfide Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language