orexin
noun
orex·in
ə-ˈrek-sən 
: either of two neuropeptides (
orexin A
and
orexin B
) that are produced in the hypothalamus and play a role in regulating wakefulness and food intake
Scientists have known for almost a decade that narcolepsy is caused by a dearth of a brain communication chemical called orexin.—
Laura Sanders, Science News
Laura Sanders, Science NewsThe new sleep aids block the activity of brain peptides called orexins.—Christine Soares, Scientific American
Christine Soares, Scientific Americancalled also hypocretin
Dictionary Entries Near orexin
Cite this Entry
“Orexin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/orexin. Accessed 25 Nov. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share