osmous


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os·mous

 (ŏz′məs) also os·mi·ous (-mē-əs)
adj.
Relating to or containing osmium in a compound with a valence lower than that in a comparable osmic compound.

osmous

(ˈɒzməs)
adj
(Chemistry) of or containing osmium in a low valence state, esp the divalent state. Also: osmious