Stomach (noun)

1. The organ in the upper abdomen that digests food and is part of the digestive system.
2. An appetite for food or drink.
3. A person's stomach is often used to refer to the area of their body where the stomach is located.
4. A feeling of discomfort or nausea in the stomach often caused by hunger, stress or emotional upset.

Origin:

Middle english: from old french estomac, based on latin stomachus, from greek stomachos "throat, stomach", from stoma "mouth". the original sense was "throat", later "gullet", and only in the late 16th century "the organ in the abdominal cavity that digests food".

Examples:

1. He had a pain in his stomach.
2. I was so hungry my stomach was rumbling.
3. I was so nervous my stomach was churning.
4. She had a strong stomach for horror movies.
5. I had to force down my food as my stomach was too full.