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[oz-mee-uh m] /ˈɒz mi əm/

noun, Chemistry.
a hard, heavy, metallic element having the greatest density of the known elements and forming octavalent compounds, as OsO 4 and OsF 8 : used chiefly as a catalyst, in alloys, and in the manufacture of electric-light filaments. Symbol: Os; atomic weight: 190.2; atomic number: 76; specific gravity: 22.57.


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  • Osmo-

    1. a combining form representing osmosis, in compound words: osmoregulation. osmo- 1 or osm- pref. Smell; odor: osmidrosis. osmo- 2 or osm- pref. Osmosis: osmolarity.

  • Osmolality

    osmolality os·mo·lal·i·ty (ŏz’mō-lāl’ĭ-tē, ŏs’-) n. The concentration of an osmotic solution, usually expressed in terms of osmoles.

  • Osmolarity

    osmolarity os·mo·lar·i·ty (ŏz’mō-lār’ĭ-tē, ŏs’-) n. The osmotic concentration of a solution expressed as osmoles of solute per liter of solution.

  • Osmole

    osmole os·mole (ŏz’mōl’, ŏs’-) n. The molecular weight of a solute, in grams, divided by the number of ions or particles into which it dissociates in solution. os·mo’lar (ŏz-mō’lər, ŏs-) adj.

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