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

 

serotonin

 noun
noun
BrE BrE//ˌserəˈtəʊnɪn//
 
; NAmE NAmE//ˌserəˈtoʊnɪn//
 
[uncountable]
 
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a chemical in the brain that affects how messages are sent from the brain to the body, and also affects how a person feels the feel‐good hormone serotonin serotonin—the happiness hormone Word Origin 1940s: from serum + tonic + -in.
See the Oxford Advanced American Dictionary entry: serotonin

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