anus
- Pronunciation
- /AY-nuhs/
- Category
- Anatomy
- Singular
- anus
- Plural
- anuses
Definition
The posterior opening of the digestive tract, used for the expulsion of waste material.
Etymology
From Latin 'ānus', meaning 'ring' or 'circle'.
Example
Certain beetles have an anus that allows them to expel defensive chemicals when threatened.
Synonyms
- Anal opening
- Rectal outlet
Related Terms
Usage Notes
In entomology and arachnology, the anus is typically a small, often musculature-controlled opening located at the end of the alimentary canal.