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Definition of nicotinic acid noun from the Oxford Advanced Learner's Dictionary

nicotinic acid

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

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