Anus

(a'nus.) [L.] (Anat.) The excrement ary orifice of the alimentary canal, or termination of the intestinum rectum. In oviparous vertebrates, it opens into a cavity common to it and the urinary organs, called the cloaca. In many of the lower cla es of invertebrate animals, one orifice performs the functions of a mouth and anus. [s. 37]