eructation (n.) Look up eructation at Dictionary.com
"belching," 1530s, from Latin eructationem (nominative eructatio) "a belching forth," noun of action from past participle stem of eructare "to belch forth, vomit," from ex- "out" (see ex-) + ructare "to belch," from PIE *reug- "to belch" (cognates: Lithuanian rugiu "to belch," Greek eryge, Armenian orcam), probably of imitative origin. Related: Eruct; eructate.