| 单词 | niobium |
| 释义 | niobium n. Chem. a rare grey-blue metallic transition element occurring naturally in several minerals and used in alloys for superconductors. Usage Symb.: Nb. Also called COLUMBIUM. Derivatives niobic adj. niobous adj. Etymology: Niobe daughter of Tantalus: so called because first found in TANTALITE |
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