Question: what is the difference between diarrhoea and diarrhea?
Answer: The word diarrhea is from the Ancient Greek διάρροια from διά dia "through" and ῥέω rheo "flow". Diarrhea is the spelling in American English, whereas diarrhoea is the spelling in British English. Slang terms for the condition include "the runs", "the squirts" (or "squits" in Britain) and "the trots".