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Definitions for: Osmium [n] a hard brittle blue-gray or blue-black metallic element that is one of the platinum metals; the heaviest metal known
Webster (1913) Definition: Os"mi*um, n. [Gr. ? a smell, odor, akin to ? to smell.
So named in allusion to the strong chlorinelike odor of osmic
tetroxide. See Odor.] (Chem.)
A rare metallic element of the platinum group, found native
as an alloy in platinum ore, and in iridosmine. It is a hard,
infusible, bluish or grayish white metal, and the heaviest
substance known. Its tetroxide is used in histological
experiments to stain tissues. Symbol Os. Atomic weight
191.1. Specific gravity 22.477.
Synonyms: atomic number 76, Os
See Also: metal, metallic element
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