A Diarrhea

1. A gastrointestinal disorder characterized by frequent and very soft or watery bowel movements. Diarrhea - Wikipedia
2. The watery or very soft excrement that comes from such bowel movements.

Usage notes

• Diarrhea is the American spelling; diarrhoea is the British / Irish spelling.

Synonyms

• (medical condition): the runs, the shits, the squirts (US), the trots, the squits (both UK), the skitters (Scottish and Northern English) (all slang)