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BNC: 0 COCA: 20581
melatonin
noun [U] biology /ˌmeləˈtəʊnɪn/
  1. a hormone (=natural substance produced in your body) that helps regulate cycles of sleeping and waking
     Synonyms and related words
    Hormones and chemicals in the body:adrenalin, endorphin, estrogen...
BNC: 0 COCA: 20581
BNC: 0 COCA: 20581

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