iridium
n. precious metallic element of the platinum group (Chemistry); modern satellite communications system that enables mobile telephone communications everywhere in the world (Cellular Communication) | ||||
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Iridium definition was found in categories: Language, Idioms & Slang(3) Science & Technology(3) Entertainment & Music(2) Encyclopedia(1)
Iridium Definition from Language, Idioms & Slang Dictionaries & Glossaries
| Webster's Revised Unabridged Dictionary (1913) |
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.
(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.
| WordNet 2.0 |
iridium
Noun
1. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
(synonym) Ir, atomic number 77
(hypernym) metallic element, metal
Noun
1. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
(synonym) Ir, atomic number 77
(hypernym) metallic element, metal
| hEnglish - advanced version |
iridium
iridium
\i*rid"i*um\ (?), n. [nl., fr. l. iris, iridis, the rainbow. so called from the iridescence of some of its solutions. see iris.] (chem.) 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.
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.
iridium
\i*rid"i*um\ (?), n. [nl., fr. l. iris, iridis, the rainbow. so called from the iridescence of some of its solutions. see iris.] (chem.) 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.
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.
Iridium Definition from Science & Technology Dictionaries & Glossaries
| Mineralogy Database |
Iridium
General Information:
Chemical Formula:
(Ir,Os,Ru)
Composition:
(Molecular Weight = 182.50 gm)
Iridium 63.20 % Ir
Osmium 31.27 % Os
Ruthenium 5.54 % Ru
Empirical Formula:
Ir0.6Os0.3Ru0.1
Locality:
CALIFORNIA
Name Origin:
Named after the element Iridium which was from the Latin, Iris = "rainbow" in allusion to the colored salts derived from its compounds.
Physical Properties:
Cleavage:
None
Color:
white.
Density:
22.6 - 22.8, Average = 22.7
Diaphaniety:
Opaque
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
white
More details...
General Information:
(Ir,Os,Ru)
(Molecular Weight = 182.50 gm)
Iridium 63.20 % Ir
Osmium 31.27 % Os
Ruthenium 5.54 % Ru
Ir0.6Os0.3Ru0.1
CALIFORNIA
Named after the element Iridium which was from the Latin, Iris = "rainbow" in allusion to the colored salts derived from its compounds.
Physical Properties:
None
white.
22.6 - 22.8, Average = 22.7
Opaque
6-7 - Orthoclase-Quartz
Non-fluorescent.
Metallic
white
More details...
Iridium (Ir )
Atomic Mass : 192.22
Atomic Number : 77
Name Origins: Latin, Iris = "rainbow."
Year Discovered : 1803
Discovery Credits : Discovered by S. Tennant at London, UK.
More Details
| Minerals |
Iridium
Ir
Ir
| Chemistry of the Elements |
Iridium
Name: iridium
Symbol: Ir
Atomic number: 77
Atomic weight: 192.217 (3)
Group in periodic table: 9
Group name: Precious metal
Period in periodic table: 6
Block in periodic table: d-block
CAS registry ID: 7439-88-5
The name iridium is appropriate, for its salts are highly coloured. Iridium is white, similar to platinum, but with a slight yellowish cast. It is very hard and brittle, making it very hard to machine, form, or work. It is the most corrosion resistant metal known, and was used in making the standard metre bar of Paris, which is a 90% platinum-10% iridium alloy. This metre bar has since been replaced as a fundamental unit of length (see Krypton).
Iridium is not attacked by any of the acids nor by aqua regia, but is attacked by molten salts, such as NaCl and NaCN.
Name: iridium
Symbol: Ir
Atomic number: 77
Atomic weight: 192.217 (3)
Group in periodic table: 9
Group name: Precious metal
Period in periodic table: 6
Block in periodic table: d-block
CAS registry ID: 7439-88-5
The name iridium is appropriate, for its salts are highly coloured. Iridium is white, similar to platinum, but with a slight yellowish cast. It is very hard and brittle, making it very hard to machine, form, or work. It is the most corrosion resistant metal known, and was used in making the standard metre bar of Paris, which is a 90% platinum-10% iridium alloy. This metre bar has since been replaced as a fundamental unit of length (see Krypton).
Iridium is not attacked by any of the acids nor by aqua regia, but is attacked by molten salts, such as NaCl and NaCN.
Iridium Definition from Entertainment & Music Dictionaries & Glossaries
| English to Federation-Standard Golic Vulcan |
Iridium
ahl-tukh
ahl-tukh
| Star Wars Planeten |
Iridium
The infamous space pirates of Iridium preyed on merchant shipping during the days of the Old Republic, until they were wiped out by the Jedi Knights. The pirates used unique "power gems," which generated a disrupting aura, to break through the shields of their victims' starships. One pirate, Raskar, managed to survive the Jedi attack and escaped with the only remaining power gem. He set up on a rimworld and invited those interested in the gem to fight for it in gladitorial combat. Han Solo and Chewbacca managed to obtain Raskar's gem following the Battle of Yavin, though the object only had enough power remaining for one final shield disruption. [CSW]
The infamous space pirates of Iridium preyed on merchant shipping during the days of the Old Republic, until they were wiped out by the Jedi Knights. The pirates used unique "power gems," which generated a disrupting aura, to break through the shields of their victims' starships. One pirate, Raskar, managed to survive the Jedi attack and escaped with the only remaining power gem. He set up on a rimworld and invited those interested in the gem to fight for it in gladitorial combat. Han Solo and Chewbacca managed to obtain Raskar's gem following the Battle of Yavin, though the object only had enough power remaining for one final shield disruption. [CSW]
Iridium Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Iridium
Iridium (IPA: ) is a chemical element that has the symbol Ir and atomic number 77. A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium. Iridium is notable for being the most corrosion resistant element known and for its significance in the determination of the probable cause of the extinction, by a meteorite strike, of the dinosaurs. It is used in high temperature apparati, electrical contacts, and as a hardening agent for platinum.
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Iridium (satellite)
The Iridium satellite constellation is a system of 66 active communication satellites with spares in orbit and on the ground. It allows worldwide voice and data communications using handheld satellite phones. The Iridium network is unique in that it covers the whole earth, including poles, oceans and airways. The service is interdicted by American embargoes in North Korea, Iran, Libya and Sudan; if one tries to use the Iridium service in one of these countries it will not work.
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