One of the mysteries of the English language finally explained.
1Vomit containing dark material; specifically blood altered by gastric fluid. In early use also (as a count noun): †an episode of vomiting such material (obsolete).
2The disease yellow fever, in which the vomiting of blood is often a prominent symptom. Now historical.
Early 17th century; earliest use found in Helkiah Crooke (1576–1648), physician and anatomist. From black + vomit. In sense 1 after post-classical Latin vomitus niger.
black vomit/ˌblak ˈvɒmɪt/
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