Definition of gastroesophageal reflux
: backward flow of the contents of the stomach into the esophagus that is due to malfunctioning of a sphincter at the lower end of the esophagus and results especially in heartburn
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Merriam-Webster unabridged
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Time Traveler for gastroesophageal reflux
The first known use of gastroesophageal reflux was in 1966
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