niobium

[ nahy-oh-bee-uh m ]

/ naɪˈoʊ bi əm /

noun Chemistry.

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.

Nearby words

niobe, niobic, niobic acid, niobid, niobite, niobium, niobous, niobrara, niort, nios, niosh

Origin of niobium

From New Latin, dating back to 1835–45; see origin at Niobe, -ium

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for niobium

Chemically related to vanadium are the two elements tantalum and columbium or niobium.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1|Various
The oxide of niobium dissolved in a bead of microcosmic salt gives a bluish colour in the reducing flame.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
The corresponding group consists of nitrogen, vanadium and niobium; they are triatomic, paramagnetic, and negative.
Occult Chemistry|Annie Besant and Charles W. Leadbeater

British Dictionary definitions for niobium

niobium

/ (naɪˈəʊbɪəm) /

noun

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°CFormer name: columbium

Word Origin for niobium

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

Medicine definitions for niobium

niobium

[ nī-ō′bē-əm ]

n. Symbol Nb

A soft ductile metallic element that is used in steel alloys and superconductors. Atomic number 41.

Science definitions for niobium

niobium

[ nī-ō′bē-əm ]

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.