The Collaborative International Dictionary
Ruthenious
Ruthenious \Ru*the"ni*ous\, a. (Chem.) Pertaining to, or containing, ruthenium; specifically, designating those compounds in which it has a lower valence as contrasted with ruthenic compounds.
Wiktionary
ruthenious
a. (context chemistry English) Pertaining to, or containing, ruthenium; designating those compounds in which it has a lower valence as contrasted with ruthenic compounds.