Etymology
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eructation (n.)

"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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Definitions of eructation

eructation (n.)
(of volcanos) pouring out fumes or lava (or a deposit so formed);
Synonyms: eruption / extravasation
eructation (n.)
a reflex that expels gas noisily from the stomach through the mouth;
Synonyms: belch / belching / burp / burping
From wordnet.princeton.edu