"belching," 1530s, from Latin eructationem (nominative eructatio) "a belching forth," noun of action from past participle stem of eructare "to belch forth, vomit," from assimilated form of ex "out" (see ex-) + ructare "to belch," from PIE *reug- "to belch" (source also of Lithuanian rūgti "to belch," Greek eryge, Armenian orcam), which is probably imitative. Related: Eruct.
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