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Medical Definition of Balantidium coli
1. A very large parasitic ciliate species, usually 50 to 80 um in length, reaching up to 200 um in pigs, found in the caecum or large intestine, swimming actively in the lumen; usually harmless in man but may invade and ulcerate the intestinal wall, producing a colitis resembling amoebic dysentery. (05 Mar 2000)