/ Dictionary / Index M muciferous: Meaning and Definition of Find definitions for: mu•cif•er•ous Pronunciation: (my-sif'ur-us), [key] — adj. secreting or containing mucus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: muciferous (Thesaurus) mucid mucilage Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language