| 单词 | niobiums |
| 释义 | niobium /nī-ōˈbi-əm/nounA metallic element (symbol Nb; atomic no 41) discovered in the mineral tantalite and used in certain alloys (formerly called columbium) ORIGIN: Niobe, from the connection with tantalite nīˈobate noun A salt of niobic acid nioˈbic adjective Containing niobium in its pentavalent form (niobic acid hydrated niobium pentoxide) niˈobite noun same as columbite (see under Columbian) nīoˈbous adjective Containing niobium with a valency of less than five |
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