anus In most animals, but not in coelenterates or Platyhelminthes, the exterior opening of the alimentary canal through which are expelled the unabsorbed remainder of food items, solid excretion products, and bacteria associated with both. In some aquatic invertebrates the posterior end of the alimentary canal is also used in respiration.
anus (ay-nŭs) n. the opening at the lower end of the alimentary canal, through which the faeces are discharged. It opens out from the anal canal and is guarded by two sphincters.
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