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Table of Contents -- platinum
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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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platinum

RELATED WORDS :

 : 
Noun
 : 
plat=i=num

WORDNET DICTIONARY

Noun platinum has 1 sense

CIDE DICTIONARY

platinumn. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See Plate, and cf. Platina.].
     A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a precious metal, occurring native or alloyed with other metals and also as the platinum arsenide (sperrylite). It is a heavy tin-white metal which is ductile and malleable, but very infusible (melting point 1772platina.  [1913 Webster]
Platinum black (Chem.), a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxygen to a high degree, and is employed as an oxidizer. -- Platinum lamp (Elec.), a kind of incandescent lamp of which the luminous medium is platinum. See under Incandescent. -- Platinum metals (Chem.), the group of metallic elements which in their chemical and physical properties resemble platinum. These consist of the light platinum group, viz., rhodium, ruthenium, and palladium, whose specific gravities are about 12; and the heavy platinum group, viz., osmium, iridium, and platinum, whose specific gravities are over 21. -- Platinum sponge (Chem.), metallic platinum in a gray, porous, spongy form, obtained by reducing the double chloride of platinum and ammonium. It absorbs oxygen, hydrogen, and certain other gases, to a high degree, and is employed as an agent in oxidizing.

OXFORD DICTIONARY

platinum, n. Chem. a ductile malleable silvery-white metallic element occurring naturally in nickel and copper ores, unaffected by simple acids and fusible only at a very high temperature, used in making jewellery and laboratory apparatus.

Idiom
platinum black platinum in powder form like lampblack. platinum blonde (or blond) adj. silvery-blond.
--n. a person with silvery-blond hair. platinum metal any metallic element found with and resembling platinum e.g. osmium, iridium, and palladium.
Usage
Symb.: Pt.
Etymology
mod.L f. earlier platina f. Sp., dimin. of plata silver
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