Alvus

The alvus, among anatomists, has sometimes been used to refer to the intestinal tube, from the stomach to the anus. Alvus, in a medical sense, is taken from the state and condition of the feces, or excrements contained within that cavity. Thus, when a person is laxative, it is called alvus liquida; and when costive, alvus adstricta. ...
Found on http://en.wikipedia.org/wiki/Alvus
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