osmium

[oz-mee-uhm]

noun

Chemistry.

1. 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. Os; 190.2; 76; 22.57.

osmium

/ ˈɒzmɪəm /

noun

1. a very hard brittle bluish-white metal occurring with platinum and alloyed with iridium in osmiridium: used to produce platinum alloys, mainly for pen tips and instrument pivots, as a catalyst, and in electric-light filaments. Symbol: Os; atomic no: 76; atomic wt: 190.2; valency: 0 to 8; relative density: 22.57; melting pt: 3033±30°C; boiling pt: 5012±100°C

osmium

1. A hard, brittle, bluish-white metallic element that is the densest naturally occurring element. It is used to make very hard alloys for fountain pen points, electrical contacts, and instrument pivots. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling point 5,000°C; specific gravity 22.57; valence 2, 3, 4, 8.

2. See Periodic Table

Word History and Origins

Origin of osmium¹

1795–1805; < New Latin < Greek osm ( ḗ ) smell + -ium -ium; named from the penetrating odor of one of its oxides

Word History and Origins

Origin of osmium¹

C19: from Greek osmē smell, so called from its penetrating odour

Example Sentences

Catalysts incorporating osmium exhibited high activity due to the expanded electrochemical active surface area achieved through nanostructure formation.

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Two geoscientists advanced the theory in 2013, partially because the levels of iridium and osmium around the impact site were lower than should appear in an asteroid and more apt for a comet impact.

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They used details of the fossils themselves and ratios of osmium isotopes in clay, whose abundance over time has been previously charted.

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It is a shiny white metal in the same group as platinum, along with ruthenium, rhodium, osmium, and iridium.

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Certain minerals such as gold, platinum, silver, tungsten, iridium, osmium, palladium, rhenium, rhodium and ruthenium might be mined and transported to Earth for on-planet use.

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