platinum

American  

[plat-n-uhm, plat-nuhm] / ˈplæt n əm, ˈplæt nəm /

noun

1. 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.

2. a light, metallic gray with very slight bluish tinge when compared with silver.

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adjective

1. made of platinum.

2. (of an audio recording) having sold a minimum of one million copies.

platinum British  

/ ˈplætɪnəm /

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

2. 1. a medium to light grey colour

   2. ( as adjective )

      a platinum carpet

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platinum Scientific  

/ plăt′n-əm /

1. 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.

2. See Periodic Table

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Etymology

Origin of platinum

1805–15; < New Latin, alteration of earlier platina < Spanish; see platina

Explanation

Platinum is a chemical element that's a heavy, precious metal. If you want a really fancy wedding band, go for platinum. Have you ever heard of a musician's album going platinum? In the U.S., that means it sold a million copies, and platinum is the precious metal used to symbolize such success. Platinum is one of the periodic table of elements, and it's often found in copper and nickel ores. Platinum won't corrode, and its color is somewhere between grey and white. Another use of this term is when someone dyes their hair so blonde it’s almost white: that’s platinum blonde.

Example Sentences

He last saw his grandchildren during the late Queen's Platinum Jubilee celebrations in 2022.

From BBC • Jun. 17, 2026

Read more: Robinhood’s new $695 Platinum card vs.

From MarketWatch • Jun. 5, 2026

Lisa Nandy, the Labour culture secretary, is speaking from her Wigan constituency which was proudly festooned with bunting during the late Queen's Platinum Jubilee in 2022.

From BBC • Jun. 5, 2026

The Platinum Equity veterans established Truelink in 2022 and closed the firm’s debut fund in 2024 with roughly $950 million to invest in the tech-enabled services and industrial sectors.

From The Wall Street Journal • Mar. 9, 2026

Platinum and gold plaques line the walls of the reception area.

From "On the Come Up" by Angie Thomas

Related Words

• gold
• iron
• metal
• mineral