OSMIOUS

Adjective

osmious (not comparable)

(chemistry) Denoting those compounds of osmium in which the element has a valence relatively lower than in the osmic compounds.

Source: Wiktionary

Os"mi*ous, a. (Chem.)

Definition: 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.] Osmious acid (Chem.), an acid derived from osmium, analogous to sulphurous acid, and forming unstable salts. It is a brown amorphous substance.

Source: Webster’s Unabridged Dictionary 1913 Edition

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