/ Dictionary / Index A atroceruleous: Meaning and Definition of Find definitions for: at•ro•ce•ru•le•ous Pronunciation: (a"trō-su-r'lē-us, -rl'yus), [key] — n. a deep blue-black color. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atrium atrocious Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language