Meanings
nounorexin (plural orexins)
plural orexins
- biochemistryEither of two neuropeptide hormones found in vertebrates; the two are orexin-A and orexin-B.
Synonyms: hypocretin
Synonyms & antonyms
nounEither of two neuropeptide hormones found in vertebrates; the two are orexin-A and orexin-B.
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Also see
Origin
- Ancient Greekὄρεξις“appetite”
- Englishorexin
From Ancient Greek ὄρεξις (órexis, “appetite”) + -in.
More words from Ancient Greek
Full word history & related roots →Cite this entry
APA
orexin. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/orexin
MLA
“orexin.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/orexin. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “orexin,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/orexin.
Source: orexin on Wiktionary, CC BY-SA 4.0.