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platinum

[plat-n-uh m, plat-nuh m] /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. 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
3.
made of platinum.
4.
(of a record, CD, or cassette) having sold a minimum of one million copies.
Origin
1805-1815
1805-15; < Neo-Latin, alteration of earlier platina < Spanish; see platina
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for platinum
  • These rods are made of copper, and are platinum-tipped and gold-plated.
  • We have a picture of her wearing it in a platinum choker.
  • The floater is made of thin sheet copper, and is suspended by a fine platinum wire.
  • The idea is that all of the platinum-level technology could be added to the other building at some point in the future.
  • He was pale pink, with poker-straight reddish-brown hair that later grew into platinum-blonde curls.
  • Not a platinum member, perhaps, but a member nonetheless.
  • Suddenly these megawatt music efforts stopped achieving multi-platinum success.
  • Her long hair hung in a heavy platinum sheet to the stage floor, which had been dirtied by her sisters' feet.
  • The new fuel cell uses a unique arrangement of two graphite discs, each containing special enzymes and connected by platinum wire.
  • Hydrogen travels across the membranes, which contain platinum, and reacts with oxygen to create electricity.
British Dictionary definitions for platinum

platinum

/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
Word Origin
C19: New Latin, from platina, on the model of other metals with the suffix -um
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for platinum
n.

metallic element, 1812, Modern Latin, from Spanish platina "platinum," diminutive of plata "silver," from Old French plate or Old Provençal plata "sheet of metal" (see plate (n.)). The metal looks like silver, and the Spaniards at first thought it an inferior sort of silver, hence the name platina. It was first obtained from Spanish colonies in Mexico and Colombia, brought to Europe in 1735, and identified as an element 1741. Taken into English as platina (c.1750), it took its modern form (with element ending -ium) in 1812, at the time the names of elements were being regularized. As a shade of blond hair, attested from 1931. As a designation for a recording that has sold at least one million copies, it is attested from 1971.

Online Etymology Dictionary, © 2010 Douglas Harper
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platinum in Medicine

platinum plat·i·num (plāt'n-əm)
n.
Symbol Pt
A ductile malleable metallic element usually occurring mixed with other metals such as iridium, osmium, or nickel and used as a catalyst and in dentistry. Atomic number 78; atomic weight 195.08; melting point 1,768°C; boiling point 3,825°C; specific gravity 21.45; valence 2, 3, 4.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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platinum in Science
platinum
  (plāt'n-əm)   
Symbol Pt
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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