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anus (n.)

"inferior opening of the alimentary canal," 1650s, from Old French anus, from Latin anus "ring, anus," from PIE root *āno- "ring." So called for its shape; compare Greek daktylios "anus," literally "ring (for the finger)," from daktylos "finger."

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Definitions of anus from WordNet

anus (n.)
the excretory opening at the end of the alimentary canal;
From wordnet.princeton.edu