Title: conjoined twin
Long Title: IUPAC Gold Book - conjoined twin
DOI: 10.1351/goldbook.10555
Status: current

Definition
One of a pair of identical twins fused together with varying degrees of union and of residual duplication of organs.

Related Terms
- identical twins: https://goldbook.iupac.org/terms/view/10836
- parasitic twin: https://goldbook.iupac.org/terms/view/11069

Source
- PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 739 (https://doi.org/10.1515/pac-2015-1202)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/10555/html
- json: https://goldbook.iupac.org/terms/view/10555/json
- xml: https://goldbook.iupac.org/terms/view/10555/xml

Citation: Citation: 'conjoined twin' 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.10555
License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.
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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: 2026-05-10T11:05:47+00:00