MELATONIN a hormone secreted by the pineal gland during the hours of darkness
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melatoninsMELATONIN, a hormone secreted by the pineal gland during the hours of darkness
melatonina hormone secreted by the pineal gland during the hours of darkness
pinealof, relating to, or secreted by the pineal gland a pineal tumor the pineal hormone melatonin
melatoninhormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin