Lesser developed of two monozygotic twins that failed to separate completely during embryogenesis.
Note: The omphalosite is joined to the other twin (the
autosite) by the umbilical vessels, receives its blood supply from the
placenta, and is incapable of survival after separation from the
placenta.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 787 (https://doi.org/10.1515/pac-2015-1202)