The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

Vomit \Vom"it\, v. i. [imp. & p. p. Vomited; p. pr. & vb. n.
   Vomiting.] [Cf. L. vomere, vomitum, and v. freq. vomitare.
   See Vomit, n.]
   To eject the contents of the stomach by the mouth; to puke;
   to spew.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vomit \Vom"it\, v. t.
   1. To throw up; to eject from the stomach through the mouth;
      to disgorge; to puke; to spew out; -- often followed by up
      or out.
      [1913 Webster]

            The fish . . . vomited out Jonah upon the dry land.
                                                  --Jonah ii.
                                                  10.
      [1913 Webster]

   2. Hence, to eject from any hollow place; to belch forth; to
      emit; to throw forth; as, volcanoes vomit flame, stones,
      etc.
      [1913 Webster]

            Like the sons of Vulcan, vomit smoke. --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vomit
    n 1: the matter ejected in vomiting [syn: vomit, vomitus,
         puke, barf]
    2: a medicine that induces nausea and vomiting [syn: emetic,
       vomit, vomitive, nauseant]
    3: the reflex act of ejecting the contents of the stomach
       through the mouth [syn: vomit, vomiting, emesis,
       regurgitation, disgorgement, puking]
    v 1: eject the contents of the stomach through the mouth; "After
         drinking too much, the students vomited"; "He purged
         continuously"; "The patient regurgitated the food we gave
         him last night" [syn: vomit, vomit up, purge, cast,
         sick, cat, be sick, disgorge, regorge, retch,
         puke, barf, spew, spue, chuck, upchuck, honk,
         regurgitate, throw up] [ant: keep down]