serotonin
noun/ˌsɛrəˈtoʊnɪn/
Frequency rank: #10,003 most common English word
Meaning
a chemical in the brain and body that helps regulate mood, happiness, and feelings of well-being.
Example sentence
After exercising regularly, she noticed that her mood improved, which her doctor said was due to higher levels of serotonin in her brain.
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