OsO4; a volatile caustic and strong oxidizing agent; colorless crystals, poorly soluble in water, but soluble in organic solvents; the aqueous solution is a fat and myelin stain and a general fixative for electron microscopy. SYN: osmium tetroxide.
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os·mic ac·id (ozґmik) 1. osmium tetroxide. 2. the hypothetical acid, H2OsO4, which forms osmate salts.Medical dictionary. 2011.