Stomach
noun
The kanji and the word are exactly the same. That means they share meanings as well.
Just keep in mind 胃 is specifically for the internal organ "stomach," not for the general abdominal area "stomach."
This has the same reading as the kanji you learned, meaning you know the reading!
ストレスで、胃がキリキリします。
My stomach aches from stress.
人生で初めて胃カメラを飲んだ。
For the first time in my life, I had a gastroscopy.
あの胃が弱い設定のキャラクター、何て名前だっけ？
What was the name of the character with the trait of having a weak stomach?
ケーキとベーコンの食べ過ぎで胃がもたれています。
I ate too much cake and bacon, and they've been heavy on my stomach.