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Definition of iridium : A rare metallic element, of the same group as platinum, which it much resembles, being silver- white, but harder, and brittle, and indifferent to most corrosive agents. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22. 4. Symbol Ir. Atomic weight 192. 5.

Synonyms:

atomic number 77, Ir

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

Usage examples:

• Bredig has in this way prepared sols of platinum, palladium, iridium, silver, and cadmium. - "The Mechanism of Life", Stéphane Leduc.
• Osmium has a specific gravity of 21. 4, and is the heaviest body in nature; platinum is 21. 15, and iridium the same; the specific gravity of the other three being only about half that, namely, 11. 3, 12. 1, and 11. 8. Then there is this curious relation, that palladium and iridium are very much alike, so that you would scarcely know one from the other, though one has only half the weight of the other, and only half the equivalent power. - "The Chemical History Of A Candle", Michael Faraday.
• We've traced everything to the needle in the portieres and it is my belief that it was part of an all- glass hypodermic with a platinum- iridium point. - "The Film Mystery", Arthur B. Reeve.