Eructation

noun

1. A belching of wind from the stomach; a belch.
2. A violent bursting forth or ejection of matter from the earth.
3. The act of belching wind from the stomach; a belch.
4. A violent belching out or emitting, as of gaseous or other matter from the crater of a volcano, geyser, etc.
5. The act of belching, of expelling gas from the stomach through the mouth.