English noun: Nb |
1. | Nb (substance) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium |
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| Synonyms | atomic number 41, niobium |
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| Broader (hypernym) | metal, metallic element |
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| Narrower (hyponym) | columbium |
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| Substance meronym | columbite, niobite |
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2. | NB (communication) a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something |
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| Samples | The margins of his book were generously supplied with pencilled NBs.
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| Synonyms | N.B., nota bene |
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| Broader (hypernym) | annotation, notation, note |
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