cephalothoracopagus
noun
ceph·a·lo·tho·ra·cop·a·gus
| \ ˌsef-ə-ˌlō-ˌthōr-ə-ˈkäp-ə-gəs, -ˌthȯr-
\
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plural cephalothoracopagi\ -ˌgī, -ˌgē
\
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Medical Definition of cephalothoracopagus
: teratological twin fetuses joined at the head, neck, and thorax