niobium
English Thesaurus
1. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium (noun.substance)
hypernym | : | metal, metallic element, |
definition | : | any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. (noun.substance) |
hyponym | : | columbium, |
definition | : | a former name for niobium (noun.substance) |
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