English noun: niobium | |||
| 1. | niobium (substance) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium | ||
| Synonyms | atomic number 41, Nb | ||
| Broader (hypernym) | metal, metallic element | ||
| Narrower (hyponym) | columbium | ||
| Substance meronym | columbite, niobite | ||