noun. any of a set of proteins, dispersed in the lateral hypothalamus, which elicit feeding and have additionally been identified as playing a role in narcolepsy.

OREXIN: "Orexin can be an enemy to some who are trying to lose weight and struggle with it."
Cite this page: N., Pam M.S., "OREXIN," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/orexin/ (accessed September 30, 2020).