samarium

[suh-mair-ee-uhm]
noun Chemistry.
a rare-earth metallic element discovered in samarskite. Symbol: Sm; atomic weight: 150.35; atomic number: 62; specific gravity: 7.49.

Origin:
1875–80; < Neo-Latin; see samarskite, -ium

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World English Dictionary
samarium (səˈmɛərɪəm)
 
n
a silvery metallic element of the lanthanide series occurring chiefly in monazite and bastnaesite and used in carbon-arc lighting, as a doping agent in laser crystals, and as a neutron-absorber. Symbol: Sm; atomic no: 62; atomic wt: 150.36; valency: 2 or 3; relative density: 7.520; melting pt: 1074°C; boiling pt: 1794°C
 
[C19: New Latin, from samarskite + -ium]

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Medical Dictionary

samarium sa·mar·i·um (sə-mâr'ē-əm, -mār'-)
n.
Symbol Sm
A metallic rare-earth element used in ferromagnetic alloys, in infrared absorbing glass, and as a neutron absorber in certain nuclear reactors. Atomic number 62; atomic weight 150.36; melting point 1,072°C; boiling point 1,790°C; specific gravity 7.52; valence 2, 3.

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Science Dictionary
samarium   (sə-mâr'ē-əm)  Pronunciation Key 
Symbol Sm
A silvery-white metallic element of the lanthanide series that exists in several forms and has seven naturally occurring isotopes. It is used to make glass that absorbs infrared light and to absorb neutrons in the fuel rods of nuclear reactors. Atomic number 62; atomic weight 150.36; melting point 1,072°C; boiling point 1,791°C; specific gravity approximately 7.50; valence 2, 3. See Periodic Table.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

samarium

(Sm), chemical element, rare-earth metal of the lanthanoid series of the periodic table. Samarium is silvery white in colour and is relatively stable in air. It was isolated as an impure oxide and spectroscopically identified as a new element (1879) by P.-E. Lecoq de Boisbaudran. Samarium occurs in many other rare-earth minerals but is almost exclusively obtained from monazite; it is also found in the products of nuclear fission. Ion-exchange techniques are used for its commercial separation and purification. The metal is conveniently prepared by the thermoreduction of its oxide, Sm2O3, with lanthanum metal, followed by distillation of the samarium metal, which is one of the most volatile rare-earth elements. Several allotropes (structural forms) of samarium exist; at room temperature its structure is rhombohedral

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Samarium and neodymium are essential materials for high-powered magnets used in electrical generators used by wind turbines.
The rare earths samarium and neodymium are especially prone to flee the mantle for the crust--and neodymium more so than samarium.
Treatment with samarium may be followed by stem cell transplant.
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