Source : Webster's Revised Unabridged Dictionary (1913)

Vomit \Vom"it\, n. [L. vomitus, from vomere, vomitum, to vomit;
   akin to Gr. ?, Skr. vam, Lith. vemiti. Cf. {Emetic},
   {Vomito}.]
   1. Matter that is vomited; esp., matter ejected from the
      stomach through the mouth.

            Like vomit from his yawning entrails poured.
                                                  --Sandys.

   2. (Med.) That which excites vomiting; an emetic.

            He gives your Hollander a vomit.      --Shak.

   {Black vomit}. (Med.) See in the Vocabulary.

   {Vomit nut}, nux vomica.

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.

Source : WordNet®

black vomit
     n : caused by a flavivirus transmitted by a mosquito [syn: {yellow
         jack}, {yellow fever}]