anus

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anus

the excretory opening at the end of the alimentary canal
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

anus

[′ā·nəs]
(anatomy)
The posterior orifice of the alimentary canal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.