The definition of an anus is the orifice that solid waste comes through to leave the body.
An example of the anus is the opening of the alimentary canal.
pl. a′nus·es or a′ni·
the opening at the lower end of the alimentary canal
Origin of anusL, ring, anus ; from Indo-European base an unverified form ?no-, ring
The opening at the lower end of the digestive tract through which solid waste is eliminated from the body.
Origin of anusMiddle English, from Latin anus, ring, anus.