noun
- Hormone secreted by the pineal gland. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). melatonin. Retrieved September 20, 2026, from http://smartdefine.org/melatonin/definitions/1212844 |
| Chicago | WordNet. 2010. "melatonin" http://smartdefine.org/melatonin/definitions/1212844 (accessed September 20, 2026). |
| Harvard | WordNet 2010, melatonin, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/melatonin/definitions/1212844>. |
| MLA | WordNet. "melatonin" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/melatonin/definitions/1212844> |