platinum metal definition, platinum metal meaning | English dictionary

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platinum metal

  

      n   any of the group of precious metallic elements consisting of ruthenium, rhodium, palladium, osmium, iridium, and platinum  
English Collins Dictionary - English Definition & Thesaurus  
Collins
platinum  
      n  
1    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  
2   
a    a medium to light grey colour  
b    (as adj)  
a platinum carpet     
     (C19: New Latin, from platina, on the model of other metals with the suffix -um)  


platinum black  
      n     (Chem)   a black powder consisting of very finely divided platinum metal. It is used as a catalyst, esp. in hydrogenation reactions  
platinum-blond   ,   (fem.)   platinum-blonde  
      adj  
1    (of hair) of a pale silver-blond colour  
2   
a    having hair of this colour  
b    (as n)  
she was a platinum blonde     
platinum disc  
      n  
a    (in Britain) an album certified to have sold 300000 copies or a single certified to have sold 600000 copies  
b    (in the U.S.) an album or single certified to have sold one million copies  
   Compare       gold disc       silver disc  
platinum metal  
      n   any of the group of precious metallic elements consisting of ruthenium, rhodium, palladium, osmium, iridium, and platinum  

English Collins Dictionary - English Definition & Thesaurus  

Collaborative Dictionary     English Definition
n.
hin, often tapered piece of material, such as wood, stone, or metal, used to fill gaps, make something level, or adjust something to fit properly
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