Definition of "NB"
NB
adjective
not comparable
adverb
not comparable
noun
plural NBs
(US, aviation) Initialism of NASA research bomber plane. (prefix code in designations)
(sports) Initialism of national best.
(oncology) Abbreviation of neuroblastoma.
(cytology) Initialism of nuclear body.
(statistics) Initialism of negative binomial.