Source : Webster's Revised Unabridged Dictionary (1913)

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.

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.

            The fish . . . vomited out Jonah upon the dry land.
                                                  --Jonah ii.
                                                  10.

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

            Like the sons of Vulcan, vomit smoke. --Milton.

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.

Source : WordNet®

vomit
     n 1: the matter ejected in vomiting [syn: {vomitus}, {puke}]
     2: a medicine that induces nausea and vomiting [syn: {emetic},
        {vomitive}, {nauseant}]
     3: the reflex act of ejecting the contents of the stomach
        through the mouth [syn: {vomiting}, {emesis}, {regurgitation},
         {disgorgement}, {puking}]

vomit
     v : 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 up}, {purge}, {cast}, {sick},
          {cat}, {be sick}, {disgorge}, {regorge}, {retch}, {puke},
          {barf}, {spew}, {spue}, {chuck}, {upchuck}, {honk}, {regurgitate},
          {throw up}] [ant: {keep down}]