1The stomach — the digestive organ that temporarily holds and begins breaking down food. Common in everyday expressions about digestion and health.
朝から何も食べていないので、胃が痛い。
I haven't eaten anything since morning, so my stomach hurts.
ストレスがたまると、胃の調子が悪くなる。
When stress builds up, my stomach starts acting up.
健康診断で胃カメラの検査を受けた。
I had a gastroscopy done at my health checkup.
空腹のまま寝ると、胃に負担がかかるらしい。
Apparently, going to sleep on an empty stomach puts a strain on it.
2An astronomical/calendrical term for 'Wei,' one of the 28 lunar mansions in traditional Chinese astronomy. Essentially unused in everyday modern Japanese.
古い暦の解説書に、二十八宿の一つとして「胃」が挙げられていた。
An old calendar guidebook listed 'Wei' (胃) as one of the twenty-eight lunar mansions.