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niobium

[nahy-oh-bee-uh m] /naɪˈoʊ bi əm/
noun, Chemistry
1.
a steel-gray metallic element resembling tantalum in its chemical properties; becomes a superconductor below 9 K; used chiefly in alloy steels. Symbol: Nb; atomic number: 41; atomic weight: 92.906; specific gravity: 8.4 at 20°C.
Origin
1835-1845
1835-45; < New Latin; see Niobe, -ium
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for niobium
  • niobium metal is used in jewelry and as an alloying agent in steel to increase its strength.
  • The inner niobium shell is shown in gray while the stainless-steel helium vessel is shown in blue.
British Dictionary definitions for niobium

niobium

/naɪˈəʊbɪəm/
noun
1.
a ductile white superconductive metallic element that occurs principally in columbite and tantalite: used in steel alloys. Symbol: Nb; atomic no: 41; atomic wt: 92.90638; valency: 2, 3, or 5; relative density: 8.57; melting pt: 2469±10°C; boiling pt: 4744°C Former name columbium
Word Origin
C19: from New Latin, from Niobe (daughter of Tantalus), so named because it occurred in tantalite
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 niobium
n.

named by German scientist Heinrich Rose, who discovered it in 1844 in the mineral tantalum; so called because in Greek mythology Niobe was the daughter of Tantalus.

Online Etymology Dictionary, © 2010 Douglas Harper
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niobium in Medicine

niobium ni·o·bi·um (nī-ō'bē-əm)
n.
Symbol Nb
A soft ductile metallic element that is used in steel alloys and superconductors. Atomic number 41; atomic weight 92.906; melting point 2,477°C; boiling point 4,744°C; specific gravity 8.57; valence 2, 3, 5.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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niobium in Science
niobium
  (nī-ō'bē-əm)   
Symbol Nb
A soft, silvery, ductile metallic element that usually occurs in nature together with the element tantalum. It is used to build nuclear reactors, to make steel alloys, and to allow magnets to conduct electricity with almost no resistance. Atomic number 41; atomic weight 92.906; melting point 2,468°C; boiling point 4,927°C; specific gravity 8.57; valence 2, 3, 5. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for niobium

Nb

chemical element, refractory metal of Group Vb of the periodic table, used in alloys, tools and dies, and superconductive magnets. Niobium is closely associated with tantalum in ores and in properties.

Learn more about Nb with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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