1) Atomic number 77 2) Catalytic converter component 3) Chemical element 4) Corrosion-resistant metal 5) Element discovered in 1803 6) Element named for the rainbow 7) Element number 77 8) Element with the symbol Ir 9) Metal 10) Metal in surgical tools 11) Metallic element 12) Platinum-like element
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1) Ir 2) Metal
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https://www.crosswordclues.com/clue/iridium
Iridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named iridium for the Greek goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. Iridium is one of the rarest elements in the Earth`s crust, with annual production and consumpti....
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http://en.wikipedia.org/wiki/Iridium
• (n.) 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.
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http://thinkexist.com/dictionary/meaning/iridium/
(Ir), chemical element, one of the platinum metals of Group VIIIb of the periodic table. It is very dense and rare and is used in platinum alloys. A ... [7 related articles]
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http://www.britannica.com/eb/a-z/i/39
A global wireless digital communication system based on a constellation of 66 Lockheed-built communications satellites (plus six on-orbit spares) in 780-km-high (little LEO) orbits inclined at 86.6° to the equator. Begun in 1997, Iridium was the first commercial satellite system to operate from low ...
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http://www.daviddarling.info/encyclopedia/I/Iridium.html
(Ir) A very hard and brittle, exceptionally corrosion-resistant, whitish-yellow metallic element. Iridium occurs in platinum ore and is used principally to harden platinum and in high-temperature materials, electrical contacts, and wear-resistant bearings. Discovered by Smithson...
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http://www.daviddarling.info/encyclopedia/I/iridium_element.html
(pronounced irr-ID-ee-um) Iridium is a heavy metal element that is rare on the Earth's surface, but abundant on chondritic meteors and in the Earth's core.
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
<chemistry, element> 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. ... Iridium usually occurs as a native alloy with osmium...
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http://www.encyclo.co.uk/local/20973
(Ir) (ĭ-rid´e-әm) a chemical element, atomic number 77, atomic weight 192.2.
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http://www.encyclo.co.uk/local/21001
A world-wide satellite telephone system that uses low-orbit satellites to provide universal global communications coverage. Iridium's original high cost and poor service almost led to the company's collapse in 1999. A reorganized Iridium now offers very competitive rates and smaller phones. Other satellite phone services include Globalstar and ICO/...
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http://www.encyclo.co.uk/local/21342
A rare earth metal often alloyed with Platinum for jewelry at either 5 or 10 percent to raise the its hardness.
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http://www.encyclo.co.uk/local/22290
a LEO satellite telecommunications system for mobiles developed by Motorola. Iridium failed to sell (mobiles and call charges too expensive? GSM too pervasive?) and went bankrupt. Now used by US Defense Department.
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http://www.encyclo.co.uk/visitor-contributions.php
I·rid'i·um (i*rĭd'ĭ*ŭm)
noun [ New Latin , from Latin
iris ,
iridis , the rainbow. So called from the iridescence of some of its solutions. See
Iris .]
(Chemistry) A rare metallic element, of the same group as platinum, which it much resembles, being si...
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http://www.encyclo.co.uk/webster/I/95
A metal and member of the platinum family, it is often alloyed with platinum to improve workability, thus you will find pieces marked something like '90% Plat. 10% Irid' to indicate that the alloy is 90 % platinum and 10% Iridium.
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http://www.indygem.com/pages/Glossary-of-Terms.html
(Ir) Type: Term Pronunciation: ī-rid′ē-ăm Definitions: 1. A white, silvery metallic element, atomic no. 77, atomic wt. 192.22; 192Ir is a radioisotope (half-life of 73.83 days) that has been used in the interstitial treatment of certain tumors.
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http://www.medilexicon.com/medicaldictionary.php?t=45672
Iridium is a metal element with the symbol Ir.
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http://www.probertencyclopaedia.com/browse/GI.HTM
[
n] - a heavy brittle metallic element of the platinum group
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http://www.webdictionary.co.uk/definition.php?query=iridium
iridium 1. Iridium, Ir 192, an artificial radioactive isotope with a half-life of 75 days, used in radiotherapy. 2. A very hard and brittle, exceptionally corrosion-resistant, whitish-yellow metallic element occurring in platinum ores and used principally to harden platinum and in high-temperature materials, electrical contacts, and wear-resistant...
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A metallic element of the platinum family, and one of the densest and rarest elements on Earth.
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https://marvelcinematicuniverse.fandom.com/wiki/Glossary
A noble metal of the platinum group. Usually extensively as a radiation source. For radiography of thin walled castings.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
Iridium is a rare, precious metal which is hard, brittle and has a low ductility, which makes it a difficult material to work. In appearance, it is a lustrous, silvery metal. It has an abundance in the earth`s crust of approximately 3x10
-6 ppm. As might be expected from its position in the periodic table, iridium is stable to air and wat...
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https://www.encyclo.co.uk/local/20687
(iridium wires) Thin radioactive wires used to give internal radiotherapy. The wires are put into the tumour under anaesthetic. Sometimes, hollow, thin tubes are put into the tumour and then tiny radioactive balls are fed into the hollow tubes from a machine.
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https://www.encyclo.co.uk/local/20753
Hard, brittle, silver-white, metallic element, atomic number 77, relative atomic mass 192.2. It is resistant to tarnish and corrosion. Together with the elements ruthenium, rhodium, palladium, osmium, and platinum, it forms the group of platinum metals which have similar physical and chemical properties. It occurs in platinum ores and as a free...
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https://www.encyclo.co.uk/local/21221
a precious metallic element resembling platinum: used in platinum alloys and for the points of gold pens. Symbol: Ir; at. wt.: 192.2; at. no.: 77; sp. gr.: 22.4 at 20°C.
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https://www.infoplease.com/dictionary/iridium
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