Platinum (noun) Definition, Meaning & Examples

noun
  1. 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. Symbol: Pt; atomic weight: 195.09; atomic number: 78; specific gravity: 21.5 at 20°C.
  2. a light, metallic gray with very slight bluish tinge when compared with silver.
adjective
  1. made of platinum.
  2. (of an audio recording) having sold a minimum of one million copies.
noun
  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
    • a medium to light grey colour
    • (as adjective)
Pt
    Platinum (noun) Definition, Meaning & Examples

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