• 胃痛いつう — stomachache
• 胃炎いえん — gastritis
• 胃酸いさん — gastric acid
• 胃腸いちょう — stomach and intestines
• 胃壁いへき — stomach lining

The character 胃 consists of the ⺼ (flesh) radical and a simplified pictograph indicating a container or organ. It clearly represents an internal digestive organ, and is frequent in anatomical and medical terms.