[nahy-oh-bee-uh m] /naɪˈoʊ bi əm/
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.
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
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.
niobium ni·o·bi·um (nī-ō’bē-əm)
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.
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.
[nahy-oh-buh s] /naɪˈoʊ bəs/ adjective 1. Chemistry. containing trivalent , as niobous chloride, NbCl 3 . 2. of or relating to . /naɪˈəʊbəs/ adjective 1. of or containing niobium in the trivalent state Also columbous
[nahy-uh-brair-uh] /ˌnaɪ əˈbrɛər ə/ noun 1. a river flowing E from E Wyoming through Nebraska to the Missouri. 431 miles (692 km) long.
[nyawr] /nyɔr/ noun 1. a city in and the capital of Deux-Sèvres, in W France. [dœ-se-vruh] /dœˈsɛ vrə/ noun 1. a department in W France. 2338 sq. mi. (6055 sq. km). Capital: Niort. /French njɔr/ noun 1. a market town in W France. Pop: 56 663 (1999) /French døsɛvrə/ noun 1. a department of W […]
[nee-ohs] /ˈni oʊs/ noun 1. Lake, a volcanic lake in Cameroon, at the NW border: eruption 1986. Netware Input/Output Subsystem