ileo-, ile- (Greek > Latin: ile, ileum, or ilium [singular], ilia [plural], groin, flank, lower part of the body, gut, bowels, abdomen, loins; from Greek eileos, verbal of eilein, to roll or twist up tightly; used earlier interchangeably with ilium, but later referred to the entire intestine], last division of the small intestine).

A combining form that denotes the ileum or the lower section of the small intestine.