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

niacin

noun
 
/ˈnaɪəsɪn/
 
/ˈnaɪəsɪn/
(also nicotinic acid)
[uncountable]
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  1. a vitamin of the B group that is found in foods such as milk and meat
See niacin in the Oxford Advanced American Dictionary

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B2
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