We found 10 dictionaries that define the word stomach upset:

General (8 matching dictionaries)

1. stomach upset: Longman Dictionary of Contemporary English
2. stomach upset: Collins English Dictionary
3. stomach upset: Vocabulary.com
4. stomach upset: Dictionary.com
5. stomach upset: Rhymezone
6. stomach upset: FreeDictionary.org
7. stomach upset: Mnemonic Dictionary
8. stomach upset: TheFreeDictionary.com

Computing (1 matching dictionary)

9. stomach upset: Encyclopedia

Medicine (1 matching dictionary)

10. University of Maryland Glossary of Medical Terms (No longer online)

(Note: See stomach_upsets as well.)

Definitions from WordNet (stomach upset) ▸ noun:  a disorder of digestive function characterized by discomfort or heartburn or nausea Opposite: digestive comfort, stomach ease ▸ Words similar to stomach upset ▸ Usage examples for stomach upset ▸ Idioms related to stomach upset ▸ Wikipedia articles (New!) ▸ Words that often appear near stomach upset ▸ Rhymes of stomach upset ▸ Invented words related to stomach upset