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  1. Oxford Dictionary

    melatonin

    • IPA[ˌmɛləˈtəʊnɪn]

    英式

    • n.
      a hormone secreted by the pineal gland which inhibits melanin formation and is thought to be concerned with regulating the reproductive cycle.

    • noun: melatonin

    • 更多解釋

    melatonin

    • IPA[ˌmeləˈtōnən]

    美式

    • n.
      a hormone secreted by the pineal gland which inhibits melanin formation and is thought to be ...

    Oxford American Dictionary