The Collaborative International Dictionary of English v.0.48:

Eruct \E*ruct"\, Eructate \E*ruc"tate\, v. t. [L. eructare; e
   out + ructare to belch: cf. F. ['e]ructer.]
   To eject, as wind, from the stomach; to belch. [R.] --Howell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

eruct
    v 1: 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]
    2: expel gas from the stomach; "In China it is polite to burp at
       the table" [syn: burp, bubble, belch, eruct]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "eruct":
   belch, blow open, blow out, break out, burp, burst forth,
   burst out, cast forth, debouch, decant, discharge, disembogue,
   disgorge, ejaculate, eject, eructate, erupt, exhaust, expel,
   extravasate, hiccup, hurl forth, irrupt, jet, outpour, pour,
   pour forth, pour out, send forth, send out, spew, spout, spurt,
   squirt, throw out, vomit