chromium

[kroh-mee-uhm]
noun
1.
a lustrous, hard, brittle, metallic element used in alloy steels for hardness and corrosion resistance, as in stainless steel, and for plating other metals: chromium salts are used as pigments and mordants. Symbol: Cr; atomic weight: 51.996; atomic number: 24; specific gravity: 7.1.
2.
chrome ( def 2 ).

Origin:
1800–10; chrome + -ium

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World English Dictionary
chromium (ˈkrəʊmɪəm)
 
n
a hard grey metallic element that takes a high polish, occurring principally in chromite: used in steel alloys and electroplating to increase hardness and corrosion-resistance. Symbol: Cr; atomic no: 24; atomic wt: 51.9961; valency: 2, 3, or 6; relative density: 7.18--7.20; melting pt: 1863±20°C; boiling pt: 2672°C
 
[C19: from New Latin, from French: chrome]

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Etymonline
Word Origin & History

chromium
1807, from Fr. chrome + element ending -ium.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chromium chro·mi·um (krō'mē-əm)
n.
Symbol Cr
A lustrous hard metallic element, resistant to tarnish and corrosion and found primarily in chromite. It is used to harden steel alloys, in decorative platings, and as a pigment in glass. Atomic number 24; atomic weight 51.996; melting point 1,907°C; boiling point 2,671°C; specific gravity 7.18; valence 2, 3, 6.

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American Heritage
Science Dictionary
chromium   (krō'mē-əm)  Pronunciation Key 
Symbol Cr
A hard, shiny, steel-gray metallic element that is rust-resistant and does not tarnish easily. It is used to plate other metals, to harden steel, and to make stainless steel and other alloys. Atomic number 24; atomic weight 51.996; melting point 1,890°C; boiling point 2,482°C; specific gravity 7.18; valence 2, 3, 6. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Isolation and partial characterization of chromium complex from alfalfa.
Chromium and nickel can find their way out of steel, but the amounts would be miniscule to nil.
Arsenic, radon and chromium are carcinogens, uranium and cadmium can damage kidneys and manganese might have neurological effects.
They will measure the ratios of chromium isotopes, and look for one that is characteristic of meteorites.
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