Volvulus \Vol"vu*lus\, n. [NL., fr. L. volvere to turn about, to roll.]

(Med.)
   (a) The spasmodic contraction of the intestines which causes colic.
   (b) Any twisting or displacement of the intestines causing obstruction; ileus. See Ileus.

Source: Webster's Revised Unabridged Dictionary (1913)