胃

1. Origins, structure, and basic meaning

• Structure: 胃 (い) is a noun for the stomach as an organ, used in both bodily sensation and anatomical description.
• Basic usage: 胃が重い makes the stomach the locus of discomfort after overeating, while 胃の位置 modifies the anatomical location explained with a model.

2. Common pitfalls and similar expressions

• Everyday discomfort and the anatomical organ
  • Although 胃が重い can be translated idiomatically as bodily discomfort, the Japanese noun remains 胃. The anatomical reference is explicit in 胃の位置.