Source : Webster's Revised Unabridged Dictionary (1913)

Eructation \Er`uc*ta"tion\, n. [L. eructatio: cf. F.
   ['e]ructation.]
   1. The act of belching wind from the stomach; a belch.

   2. A violent belching out or emitting, as of gaseous or other
      matter from the crater of a volcano, geyser, etc.

Source : WordNet®

eructation
     n 1: (of volcanos) pouring out fumes or lava (or a deposit so
          formed) [syn: {eruption}, {extravasation}]
     2: a reflex that expels wind noisily from the stomach through
        the mouth [syn: {belch}, {belching}, {burp}, {burping}]