Look up: Iridium

1. Iridium
   (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.
   Found on http://www.enchantedlearning.com/subject
   
   
2. Iridium
   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.
   Found on http://www.indygem.com/pages/Glossary-of
   
   
3. iridium
   [n] - a heavy brittle metallic element of the platinum group
   Found on http://www.webdictionary.co.uk/definitio
   
   
4. Iridium
   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.
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
5. Iridium
   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 th...
   Found on http://www.diracdelta.co.uk/science/sour
   
   
6. Iridium
   (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.
   Found on http://www.cancerhelp.org.uk/utilities/g
   
   
7. Iridium
   a greyish-white,hard metal,resistant to the action of acids,including aqua regia,at normal and high temperatures Category: Chemistry • chemical element:atomic number 77 Category: Chemistry
   Found on http://www.mijnwoordenboek.nl/definition
   
   
8. Iridium
   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 gr...
   Found on http://www.encyclo.co.uk/webster/I/95
   
   
9. iridium
   <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. ... Ir...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
10. iridium
    (Ir) (ĭ-rid´e-әm) a chemical element, atomic number 77, atomic weight 192.2.
    Found on http://www.encyclo.co.uk/local/21001
    
    
11. 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.
    Found on http://thinkexist.com/dictionary/meaning
    
    
12. 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]
    Found on http://www.britannica.com/eb/a-z/i/39
    
    
13. 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 ...
    Found on http://www.wordinfo.info/words/index/inf
    
    
14. IRIDIUM
    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.
    Found on http://www.glossarycentral.com/cell_phon
    
    
15. Iridium
    Iridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named the iridium for the 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 Eart...
    Found on http://en.wikipedia.org/wiki/Iridium
    
    
16. iridium
    (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...
    Found on http://www.daviddarling.info/encyclopedi
    
    
17. Iridium
    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 ...
    Found on http://www.daviddarling.info/encyclopedi
    
    
18. iridium
    iridium (irid'ēum) , metallic chemical element; symbol Ir; at. no. 77; at. wt. 192.22; m.p. about 2,410°C; b.p. about 4,130°C; sp. gr. 22.55 at 20°C; valence +3 or +4. Iridium is a very hard, usually brittle, extremely corrosion-resistant silver-white metal with a face-centered...
    Found on http://www.infoplease.com/ce6/sci/A08254
    
    
19. Iridium
    Iridium is a metal element with the symbol Ir.
    Found on http://www.probertencyclopaedia.com/brow
    
    
20. iridium
    (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.
    Found on http://www.medilexicon.com/medicaldictio
    
    
21. iridium
    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...
    Found on http://www.talktalk.co.uk/reference/ency
    
    
22. Iridium
    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 sa...
    Found on http://www.german-way.com/handy_voc.html
    
    
23. Iridium
    [disambiguation] Iridium is the chemical element with atomic number 77. Iridium may also refer to: ...
    Found on http://en.wikipedia.org/wiki/Iridium_(di