Regurgitation

noun

1. The act of regurgitating or pouring back.
2. The act of swallowing again; reabsorption.
3. In medicine: The puking or posseting of infants.
4. The rising of solids or fluids into the mouth in the adult.
5. Specifically, the reflux through incompetent heart-valves: as, aortic regurgitation (reflux through leaking aortic valves).