1. [ noun ] (writing) a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something
Synonyms: nota_bene n.b.

"the margins of his book were generously supplied with pencilled NBs"

Related terms: note
2. [ noun ] (chemistry) a soft gray ductile metallic element used in alloys; occurs in niobite; formerly called columbium
Synonyms: atomic_number_41 niobium
Related terms: metallic_element columbium niobite
Similar spelling:   NbW