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platinum
[plat-n-uhm, plat-nuhm]
noun
Chemistry.a heavy, grayish-white, highly malleable and ductile metallic element, resistant to most chemicals, practically unoxidizable except in the presence of bases, and fusible only at extremely high temperatures: used for making chemical and scientific apparatus, as a catalyst in the oxidation of ammonia to nitric acid, and in jewelry. Pt; 195.09; 78; 21.5 at 20°C.
a light, metallic gray with very slight bluish tinge when compared with silver.
adjective
made of platinum.
(of an audio recording) having sold a minimum of one million copies.
platinum
/ ˈæɪə /
noun
a ductile malleable silvery-white metallic element, very resistant to heat and chemicals. It occurs free and in association with other platinum metals, esp in osmiridium: used in jewellery, laboratory apparatus, electrical contacts, dentistry, electroplating, and as a catalyst. Symbol: Pt; atomic no: 78; atomic wt: 195.08; valency: 1–4; relative density: 21.45; melting pt: 1769°C; boiling pt: 3827±100°C
a medium to light grey colour
( as adjective )
a platinum carpet
platinum
A soft, ductile, malleable, silver-white metallic element that usually occurs with osmium, iridium, palladium, or nickel. It has a high melting point and does not corrode in air. Platinum is used as a catalyst and in making jewelry, electrical contacts, and dental crowns. Atomic number 78; atomic weight 195.08; melting point 1,772°C; boiling point 3,827°C; specific gravity 21.45; valence 2, 3, 4.
See Periodic Table
51Թ History and Origins
51Թ History and Origins
Origin of platinum1
Example Sentences
A selection of platinum and gold discs, recognising millions of record sales, will also be on show.
I’m practically a platinum member because I’m about really nice experiences.
South Africa currently exports a variety of minerals to the US, including platinum, iron and manganese, as well as precious stones, metals and fruit.
In the 8½ years since the robbery, only one piece has been recovered: a diamond cross on platinum that the suspects lost as they escaped on bicycles.
The four have now marked the rare double platinum anniversary together, this time with their children, grandchildren and great-grandchildren for company.
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