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niobous

[nahy-oh-buh s]
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adjective
  1. Chemistry. containing trivalent niobium, as niobous chloride, NbCl3.
  2. of or relating to niobium.
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Origin of niobous

First recorded in 1860–65; niob(ium) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for niobous

niobous

adjective
  1. of or containing niobium in the trivalent stateAlso: columbous
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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