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



BrE BrE//ˌserəˈtəʊnɪn//
; NAmE NAmE//ˌserəˈtoʊnɪn//
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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 Origin1940s: from serum + tonic + -in.
See the Oxford Advanced American Dictionary entry: serotonin

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