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Iridium   Listen
noun
iridium  n.  (Chem.) A rare metallic element of atomic number 77, of the same group as platinum, which it much resembles, being silver-white and indifferent to most corrosive agents, but harder, more brittle, and with a higher melting temperature (2410° C, versus platinum 1772° C). With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4. Symbol Ir. Atomic weight 192.22. Note: Iridium usually occurs as a native alloy with osmium (iridosmine or osmiridium), which may occur alone or with platinum. Iridium, as an alloy with platinum, is used in bushing the vents of heavy ordnance. It is also used for the points of gold pens, and in a finely powdered condition (iridium black), for painting porcelain black.






Collaborative International Dictionary of English 0.48








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"Iridium" Quotes from Famous Books



... is a top made of platinum, the heaviest of metals, except iridium—which it would be impossible to procure enough of, and which would be difficult to work into the proper shape. It is surrounded you will observe, by an air-tight receiver, communicating by this tube with ...
— Annals of a Quiet Neighbourhood • George MacDonald

... Vincent. 'You don't know how hard it is nowadays even for me, to find something that really gets under the public's damned iridium-plated hide. But I've got ...
— A Diversity of Creatures • Rudyard Kipling

... Selenium and its Compounds (Tables), Arsenic ditto, Chromium ditto, Vanadium ditto, Molybdenum ditto, Tungsten ditto, Antimony ditto, Tellurium ditto, Tantalum ditto, Titanium ditto, Silicium ditto, Osmium ditto, Gold ditto, Iridium ditto, Rhodium ditto, Platinum ditto, Palladium ditto, Mercury ditto, Silver ditto, Copper ditto, Uranium ditto, Bismuth and its Compounds, Tin ditto, Lead ditto, Cerium ditto, Cobalt ditto, Nickel ditto, Iron ditto, Cadmium ditto, Zinc ditto, Manganese ditto, Observations, ...
— The Dyeing of Cotton Fabrics - A Practical Handbook for the Dyer and Student • Franklin Beech

... own countrymen. That fight in the arsenal was a vivid incident in this closing chapter of the history of war. To the last the 'patriots' were undecided whether, in the event of a defeat, they would explode their supply of atomic bombs or not. They were fighting with swords outside the iridium doors, and the moderates of their number were at bay and on the verge of destruction, only ten, indeed, remained unwounded, when the republicans ...
— The World Set Free • Herbert George Wells



Words linked to "Iridium" :   atomic number 77, metallic element, ir



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