Orexin

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Either of two neuropeptide hormones found in vertebrates; the hypocretins.

Synonyms

All synonyms
hypocretin

Etymology

From Ancient Greek ὄρεξις (órexis, “appetite”) + -in.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.