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| mel·a·to·nin [ mèllə tṓnin ] |
noun |
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| Definition: |
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color-changing hormone: a hormone derived from serotonin and secreted by the pineal gland that produces changes in the skin color of vertebrates, reptiles, and amphibians and is important in regulating biorhythms
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| [Mid-20th century. Blend of melano- + serotonin] |
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