mel.a.to.nin
n.（名词）A hormone derived from serotonin and produced by the pineal gland that stimulates color change in the epidermis of amphibians and reptiles but whose function in mammals is not clear.降黑素：由松果体产生且来自血清素的一种激素，能刺激两栖动物和爬行动物表皮颜色的变化，但这种激素的作用对哺乳动物不明显
来源：Greek melas [black] 希腊语 melas [黑] tone tone-in -in
