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The Collaborative International Dictionary of English v.0.48 (gcide)

Osmic \Os"mic\, a. (Chem.)
Pertaining to, derived from, or containing, osmium;
specifically, designating those compounds in which it has a
valence higher than in other lower compounds; as, osmic
oxide.
[1913 Webster]

{Osmic acid}. (Chem.)
(a) Osmic tetroxide. [Obs.]
(b) Osmic acid proper, an acid analogous to sulphuric acid,
not known in the free state, but forming a well-known and
stable series of salts (osmates), which were formerly
improperly called osmites.

{Osmic tetroxide} (Chem.), a white volatile crystalline
substance, {OsO4}, the most stable and characteristic of
the compounds of osmium. It has a burning taste, and gives
off a vapor, which is a powerful irritant poison,
violently attacking the eyes, and emitting a strong
chlorinelike odor. Formerly improperly called {osmic
acid}.
[1913 Webster]

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