Irritable Bowel Syndrome (IBS)
Here's your citation in American Psychological Association (APA) format:
Irritable Bowel Syndrome (IBS). (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Irritable+Bowel+Syndrome+%28IBS%29