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