di·ar·rhe·a 
(dī′ə-rēə)
(dī′ə-rēə)n.
Excessive and frequent evacuation of watery feces.
[Middle English diaria, from Medieval Latin, from Late Latin diarrhoea, from Greek diarroia, from diarrein, to flow through : dia-, dia- + rhein, to flow, run; see sreu- in the Appendix of Indo-European roots.]
di′ar·rheal, di′ar·rheic (-ĭk), di′ar·rhetic (-rĕtĭk) adj.