/ Dictionary / Index M mucous: Meaning and Definition of Find definitions for: mu•cous Pronunciation: (my'kus), [key] — adj. pertaining to, consisting of, or resembling mucus. containing or secreting mucus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mucous (Thesaurus) mucosa mucous membrane Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language