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From The Collaborative International Dictionary of English v.0.48:
Osmious \Os"mi*ous\, a. (Chem.) Denoting those compounds of osmium in which the element has a valence relatively lower than in the osmic compounds; as, osmious chloride. [Written also osmous.] [1913 Webster] Osmious acid (Chem.), an acid derived from osmium, analogous to sulphurous acid, and forming unstable salts. It is a brown amorphous substance. [1913 Webster]