Volvulus

from The Century Dictionary.

• noun Occlusion of the intestine, caused by a sharp bend or twist of the tube.

from the GNU version of the Collaborative International Dictionary of English.

• noun The spasmodic contraction of the intestines which causes colic.
• noun Any twisting or displacement of the intestines causing obstruction; ileus. See ileus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun abnormal twisting of the intestines (usually in the area of the ileum or sigmoid colon) resulting in intestinal obstruction