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cerium

[seer-ee-uh m] /ˈsɪər i əm/
noun
1.
a steel-gray, ductile metallic element of the rare-earth group found only in combination. Symbol: Ce; atomic weight: 140.12; atomic number: 58.
Origin
1795-1805
1795-1805; Cer(es) + -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for cerium
  • The catalytic converter on your exhaust system contains cerium and lanthanum.
  • cerium usually plays a supporting role to platinum, which is a more active catalyst but also more expensive.
  • Some companies are claiming to have done exactly that, by manufacturing fuel additives made of nanometer-sized cerium particles.
  • Both cerium and aluminum form many useful alloys with other metals.
  • cerium is a silvery metal, belonging to the lanthanide group.
  • cerium oxidizes slowly in cold water and rapidly in hot water.
  • cerium is used in stainless steel as a precipitation hardening agent.
  • cerium is used in alloys that are used to make permanent magnets.
  • However, not all cerium purification methods relied on basicity.
British Dictionary definitions for cerium

cerium

/ˈsɪərɪəm/
noun
1.
a malleable ductile steel-grey element of the lanthanide series of metals, used in lighter flints and as a reducing agent in metallurgy. Symbol: Ce; atomic no: 58; atomic wt: 140.115; valency: 3 or 4; relative density: 6.770; melting pt: 798°C; boiling pt: 3443°C
Word Origin
C19: New Latin, from Ceres (the asteroid) + -ium
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 cerium
n.

element, first isolated in pure form in 1875, named for ceria, the name of the earth from which it was taken, which was discovered in 1803 and named by Berzelius and Hissinger for Ceres, the minor planet, which had been discovered in 1801 and named for the Roman goddess Ceres.

Online Etymology Dictionary, © 2010 Douglas Harper
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cerium in Medicine

cerium ce·ri·um (sēr'ē-əm)
n.
Symbol Ce
A lustrous, malleable metallic rare-earth element that occurs chiefly in the minerals monazite and bastnaesite, exists in four allotropic states, and is used in lighter flint alloys. Atomic number 58; atomic weight 140.12; melting point 799°C; boiling point 3,424°C; specific gravity 6.67; valence 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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cerium in Science
cerium
  (sîr'ē-əm)   
Symbol Ce
A shiny, gray metallic element of the lanthanide series. It is ductile and malleable and is used in electronic components, alloys, and lighter flints. It is also used in glass polishing and as a catalyst in self-cleaning ovens. Atomic number 58; atomic weight 140.12; melting point 795°C; boiling point 3,468°C; specific gravity 6.67 to 8.23; valence 3, 4. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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