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WordNet (r) 3.0 (2006) (WordNet)

Nb
n 1: a soft grey ductile metallic element used in alloys; occurs
in niobite; formerly called columbium [synonym: {niobium},
{Nb}, {atomic number 41}]
2: a Latin phrase (or its abbreviation) used to indicate that
special attention should be paid to something; "the margins
of his book were generously supplied with pencilled NBs"
[synonym: {nota bene}, {NB}, {N.B.}]