'Black vomit' definitions:

Definition of 'black vomit'

noun

Caused by a flavivirus transmitted by a mosquito [syn: yellow jack, yellow fever, black vomit]

From: GCIDE

Vomit \Vom"it\, n. [L. vomitus, from vomere, vomitum, to vomit; akin to Gr. ?, Skr. vam, Lith. vemiti. Cf. Emetic, Vomito.] [1913 Webster]
1. Matter that is vomited; esp., matter ejected from the stomach through the mouth. [1913 Webster]
Like vomit from his yawning entrails poured. --Sandys. [1913 Webster]
2. (Med.) That which excites vomiting; an emetic. [1913 Webster]
He gives your Hollander a vomit. --Shak. [1913 Webster]
Black vomit. (Med.) See in the Vocabulary.
Vomit nut, nux vomica. [1913 Webster]

From: GCIDE

Black vomit \Black" vom"it\ (Med.) A copious vomiting of dark-colored matter; or the substance so discharged; -- one of the most fatal symptoms in yellow fever. [1913 Webster] Black wash