ruthenious

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Relating to or containing ruthenium with a low valence.

from The Century Dictionary.

• Pertaining to or derived from ruthenium: noting compounds having a lower valence than ruthenic compounds.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Pertaining to, or containing, ruthenium; specifically, designating those compounds in which it has a lower valence as contrasted with ruthenic compounds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry Pertaining to, or containing, ruthenium; designating those compounds in which it has a lower valence as contrasted with ruthenic compounds.