The anterior or cardiac orifice of the stomach, where the esophagus enters it.

The area of the stomach surrounding its connection with the esophagus.

the opening into the stomach and that part of the stomach connected to the esophagus

In nematodes: Valvular apparatus connecting the esophagus and intestine. Sometimes called the cardiac valve or esophago-intestinal valve. ( 14)

The part of the stomach that adjoins the esophagus.