Source : Webster's Revised Unabridged Dictionary (1913)

Dysentery \Dys"en*ter*y\, n. [L. dysenteria, Gr. ?; ? ill, bad +
   ?, pl. ?, intestines, fr. 'ento`s within, fr. ? in, akin to
   E. in: cf. F. dysenterie. See {Dys}, and {In}.] (Med.)
   A disease attended with inflammation and ulceration of the
   colon and rectum, and characterized by griping pains,
   constant desire to evacuate the bowels, and the discharge of
   mucus and blood.

   Note: When acute, dysentery is usually accompanied with high
         fevers. It occurs epidemically, and is believed to be
         communicable through the medium of the alvine
         discharges.

Source : WordNet®

dysentery
     n : an infection of the intestines marked by severe diarrhea