Title: anus
Long Title: IUPAC Gold Book - anus
DOI: 10.1351/goldbook.10415
Status: current

Definition
External opening of the rectum to the body surface, controlled by the anal sphincter.

Related Terms
- imperforate anus: https://goldbook.iupac.org/terms/view/10840
- sphincter: https://goldbook.iupac.org/terms/view/11247

Source
- PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 725 (https://doi.org/10.1515/pac-2015-1202)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/10415/html
- json: https://goldbook.iupac.org/terms/view/10415/json
- xml: https://goldbook.iupac.org/terms/view/10415/xml

Citation: Citation: 'anus' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.10415
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-05-15T07:54:03+00:00