There are 2 definitions of Nb in English:

Nb1

Syllabification: Nb

symbol

The chemical element niobium.

Definition of Nb in:

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Word of the day envenom
Pronunciation: enˈvenəm
verb
put poison on or into; make poisonous

There are 2 definitions of Nb in English:

NB2

Syllabification: NB

abbreviation

1New Brunswick (in official postal use).
1.1Nota bene; take special note (used to precede a written note).
[Latin]

Definition of Nb in: