释义 |
mel·a·to·nin \¦melə¦tōnə̇n\ noun (-s) Etymology: probably from melanocyte + serotonin; from its power to lighten melanocytes : a vertebrate hormone C13H16N2O2 that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms |