syncephalus

synonym: monocephalus
https://doi.org/10.1351/goldbook.11273

Conjoined twins with two bodies and a fused head.

Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 810 (https://doi.org/10.1515/pac-2015-1202)