American English

Definition of free radical noun from the Oxford Advanced American Dictionary

 

free radical

 noun
noun
 
(chemistry)
 
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an atom or group of atoms that has an electron that is not part of a pair, causing it to take part easily in chemical reactions. Free radicals in the body are thought to be one of the causes of diseases such as cancer. see also antioxidant
See the Oxford Advanced Learner's Dictionary entry: free radical