Sentence:  The perpetual vomiting in <WSD>ileus</WSD> is caused in like manner by the defective excitement of the sensorial power of association by the bowel, which is torpid during the intervals of pain; and the stomach sympathizes with it. 
Meaning of the word marked with <WSD> tags:  Disruption of the normal propulsive ability of the gastrointestinal tract from any cause.