/ Dictionary / Index R ruthenious: Meaning and Definition of Find definitions for: ru•the•ni•ous Pronunciation: (r-thē'nē-us, -thēn'yus), [key] — adj. Chem. containing bivalent ruthenium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ruthenic ruthenium Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language