| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| acid reflux | |
| —n | |
| the regurgitation of stomach acid into the oesophagus, causing heartburn | |
| acid reflux
See heartburn. |
| gastroesophageal reflux disease (gās'trō-ĭ-sŏf'ə-jē'əl) Pronunciation Key
A condition in which relaxation of the lower esophageal sphincter allows gastric acids to move up into the esophagus, causing heartburn, dyspepsia, and possible injury to the mucous membranes lining the esophagus. |