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Definition of flavonoid noun from the Oxford Advanced American Dictionary

 

flavonoid

 noun
noun
NAmE//ˈfleɪvəˌnɔɪd//
 
(chemistry)
 
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a type of substance that is found in some plants such as tomatoes, and is thought to protect against some types of cancer and heart disease
See the Oxford Advanced Learner's Dictionary entry: flavonoid