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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
/ ˈplætɪnəm /
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
/ plăt′n-əm /
- 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
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Word History and Origins
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Word History and Origins
Origin of platinum1
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Example Sentences
Eventually, she did—more or less—reinventing herself as Nicki Minaj and becoming a platinum-selling hip-hop superstar.
He also earned a Grammy and platinum record for “Up Where We Belong.”
Delta is a Platinum Global Partner, ranking them among the highest-level contributors to the association.
Well, Beyoncé Platinum is rumored to include a remix featuring the singer.
A platinum plan pays 90 percent of costs; gold plans pay 80 percent; silver plans pay 70 percent; bronze pay 60 percent.
We've got to get that platinum shipment off the C-49 and get into communication with headquarters at Deliphon somehow.
Though small, each box was extremely heavy, being loaded with a fortune in platinum bars.
Colloidal platinum in water is negative, in a mixture of water and alcohol, positive.
Colloidal preparations of platinum, silver and many other metals may be prepared in the same way.
Brass—or-molu—gilt platinum to give it weight; this is from Birmingham, not from Australia, nor nature.
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