Definition of niacin noun from the Oxford Advanced Learner's Dictionary

 

niacin

 noun
noun
BrE BrE//ˈnaɪəsɪn//
 
; NAmE NAmE//ˈnaɪəsɪn//
 
(also nicotinic acid)[uncountable]
 
jump to other results
a vitamin of the B group that is found in foods such as milk and meat
See the Oxford Advanced American Dictionary entry: niacin