What is the medical term meaning regurgitation?

Regurgitation of fluids backwards compared to their normal course is known as reflux. For example, movement of stomach contents backwards through the esophagus is esophageal reflux. "Brash" is sometimes used to describe this phenomenon as well. If this fluid exits forefully through the mouth, it's referred to as emesis (commonly known as vomiting). Vesicoureteral reflux is backwards regurgitation of urine from the bladder to the ureters. In describing movement of blood through heart valves, "regurgitation" is normally used.