/ Dictionary / Index C columbous: Meaning and Definition of Find definitions for: co•lum•bous Pronunciation: (ku-lum'bus), [key] — adj. Chem. niobous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. columbium Columbus Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language