Lexic.us

Definition of Iridium

1. Noun. A heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium.

Definition of Iridium

1. 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.

Definition of Iridium

1. Noun. A metallic chemical element (''symbol'' Ir) with an atomic number of 77. ¹

¹ Source: wiktionary.com

Definition of Iridium

1. a metallic element [n -S]

Medical Definition of Iridium

1. 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 (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. Atomic weight: 192.5 Abbreviation: Ir Origin: NL, fr. L. Iris, iridis, the rainbow. So called from the iridescence of some of its solutions. See Iris. (30 Mar 1998)

Lexicographical Neighbors of Iridium

Literary usage of Iridium

Below you will find example usage of this term as found in modern and/or classical literature:

1. Standard Methods of Chemical Analysis: A Manual of Analytical Methods and by Wilfred Welday Scott (1922)
"iridium is weighed as the metal. Preparation and Solution of the Sample Platinum scrap and contact points, etc., containing iridium dissolve with difficulty ..."

2. A Dictionary of Chemistry and the Allied Branches of Other Sciences by Henry Watts (1871)
"The separation of iridium from rhodium may be effected, when the former is in the state of dichloride and the Litter in the state of ..."

3. A Treatise on Chemistry by Henry Enfield Roscoe, Carl Schorlemmer (1884)
"iridium is also distinguished from platinum by the formation of a colourless ... iridium, like platinum, is always determined quantitatively as the metal. ..."

4. Chemistry by William Thomas Brande, Alfred Swaine Taylor (1863)
"The alloy of iridium and Osmium remaining after the ore of platinum has been digested in aqua regia, may be decomposed by fusing it with chloride of sodium, ..."

5. Standard Methods of Chemical Analysis: A Manual of Analytical Methods and by Wilfred Welday Scott (1922)
"iridium is weighed as the metal. Preparation and Solution of the Sample Platinum scrap and contact points, etc., containing iridium dissolve with difficulty ..."

6. A Dictionary of Chemistry and the Allied Branches of Other Sciences by Henry Watts (1871)
"The separation of iridium from rhodium may be effected, when the former is in the state of dichloride and the Litter in the state of ..."

7. A Treatise on Chemistry by Henry Enfield Roscoe, Carl Schorlemmer (1884)
"iridium is also distinguished from platinum by the formation of a colourless ... iridium, like platinum, is always determined quantitatively as the metal. ..."

8. Chemistry by William Thomas Brande, Alfred Swaine Taylor (1863)
"The alloy of iridium and Osmium remaining after the ore of platinum has been digested in aqua regia, may be decomposed by fusing it with chloride of sodium, ..."

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