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

serotonin

noun
 
/ˌserəˈtəʊnɪn/
 
/ˌserəˈtəʊnɪn/
[uncountable]
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  1. 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 serotonin in the Oxford Advanced American Dictionary
Check pronunciation: serotonin

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trait
noun
 
 
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