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Definition of Hiatus hernia
1. Noun. Hernia resulting from the protrusion of part of the stomach through the diaphragm.
Medical Definition of Hiatus hernia
1. Protrusion of the stomach up into the opening normally occupied by the oesophagus in the diaphragm, the muscle that separates the chest (thoracic) cavity from the abdomen. Hiatus in latin means an opening. (12 Dec 1998)