/ Dictionary / Index Z zealous: Meaning and Definition of Find definitions for: zeal•ous Pronunciation: (zel'us), [key] — adj. full of, characterized by, or due to zeal; ardently active, devoted, or diligent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: zealous (Thesaurus) zealotry zeatin Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language