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Definition of osmium : 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:

oculus sinister, atomic number 76, Os, operating system, bone

europium, iodine, cobalt, zinc, neodymium, arsenic, carbon, argon, beryllium, silver, polonium, boron, promethium, platinum, antimony, radium, americium, chlorine, sulfur, manganese, tellurium, cadmium, erbium, copper, technetium, praseodymium, lutetium, cesium, fermium, germanium, neptunium, oxygen, lead, thallium, palladium, mendelevium, californium, rhodium, xenon, berkelium, curium, thulium, ruthenium, lithium, gallium, niobium, magnesium, mercury, iron, uranium, phosphorus, tin, bromine, terbium, cerium, krypton, nickel, holmium, scandium, potassium, rubidium, thorium, helium, nobelium, strontium, hydrogen, indium, neon, gold, hafnium, vanadium, sodium, bismuth, molybdenum, rhenium, ytterbium, einsteinium, gadolinium, calcium, nitrogen, plutonium, titanium, dysprosium, lanthanum, francium, iridium, chromium, selenium, aluminum, yttrium, tungsten, silicon, astatine, actinium, tantalum, fluorine, barium, radon, zirconium, samarium, element, protactinium

metal

Usage examples:

• It had a mottled, pinkish shine, partly from untarnished lead, osmium, considerable uranium, some iron, nickel, silver, copper. - "The Planet Strappers", Raymond Zinke Gallun.
• Osmium is the most difficult to fuse: indeed, I believe it never has been fused, while every other metal has. - "The Chemical History Of A Candle", Michael Faraday.
• In that state of combination, as shewn in the table, the iridium and osmium are found combined in crystals, sometimes to the amount of 0. 5 per cent. - "The Chemical History Of A Candle", Michael Faraday.