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irritable bowel syndrome

a chronic gastrointestinal ailment lacking a specific known cause, characterized by abdominal pain, cramps, and diarrhea: abbrev. IBS

See irritable bowel syndrome in American Heritage Dictionary 4

noun
A chronic disorder characterized by motor abnormalities of the small and large intestines, causing variable symptoms including cramping, abdominal pain, constipation, and diarrhea. Also called irritable colon, spastic colon.

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