The Collaborative International Dictionary of English v.0.48:

Spew \Spew\, v. t. [imp. & p. p. Spewed; p. pr. & vb. n.
   Spewing.] [OE. spewen, speowen, AS. sp[imac]wan;n to D.
   spuwen to spit. OS & OHG. sp[imac]wan, G. speien, Icel. sp?ja
   to spew, Sw. spy, Dan. spye, Goth. spiewan, th. spjauti, L.
   spuere to split, Gr. ???, Skr. shtiv, shth[imac]v. Cf.
   Pyke, Spit.] [Written also spue.]
   1. To eject from the stomach; to vomit.
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   2. To cast forth with abhorrence or disgust; to eject.
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            Because thou art lukewarm, and neither hot nor cold,
            I will spew thee out of my mouth.     --Rev. ii. 16.
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The Collaborative International Dictionary of English v.0.48:

Spew \Spew\, v. i.
   1. To vomit. --Chaucer.
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   2. To eject seed, as wet land swollen with frost.
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The Collaborative International Dictionary of English v.0.48:

Spew \Spew\, n.
   That which is vomited; vomit.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spew
    v 1: expel or eject (saliva or phlegm or sputum) from the mouth;
         "The father of the victim spat at the alleged murderer"
         [syn: spit, ptyalize, ptyalise, spew, spue]
    2: eject or send out in large quantities, also metaphorical;
       "the volcano spews out molten rocks every day"; "The editors
       of the paper spew out hostile articles about the Presidential
       candidate" [syn: spew, spew out, eruct]
    3: 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]

Moby Thesaurus II by Grady Ward, 1.0:

115 Moby Thesaurus words for "spew":
   barf, be seasick, be sick, belch, blow open, blow out, break out,
   bring up, burst, burst forth, burst out, cascade, cast forth,
   chuck up, debouch, debouchment, decant, discharge, disembogue,
   disgorge, disgorgement, dissiliency, drain, drain out, dribble,
   drivel, drool, egest, egesta, egestion, ejaculate, eject, emit,
   empty, eruct, eructation, erupt, eruption, exhaust, expectorate,
   expel, extravasate, feed the fish, find vent, flare-up, flood,
   flow, flow out, flush, font, fount, fountain, gag, gagging, geyser,
   gush, gush out, hawk, heave, heave the gorge, heaves, heaving,
   hurl forth, irrupt, jet, keck, nausea, outbreak, outburst, outflow,
   outpour, play, pour, pour forth, pour out, puke, rapids,
   regurgitate, regurgitation, reject, retch, run out, rush, salivate,
   send forth, send out, sick up, slabber, slaver, slobber,
   sluice out, spate, spew out, spit, spout, spout out, spouter,
   spray, spritz, spurt, spurtle, squirt, surge, throw out, throw up,
   torrent, upchuck, volcan, vomit, vomit forth, vomit out, vomiting,
   vomition, well, well out