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Webster 1913 Edition

Adj.

(Chem.)

Pertaining to, or containing, ruthenium; specifically, designating those compounds in which it has a lower valence as contrasted with

ruthenic

compounds.

ruthenious ‎(not comparable)

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