noun(plural craniopagi/kreɪnɪˈɒpəɡʌɪ/)[usually as modifier]
A pair of conjoined twins attached at the head.However, this is the first time surgeons have tried to separate adult craniopagus twins....
Carson was the primary neurosurgeon that successfully separated seven-month-old German craniopagus twin boys.
Manar was born with a rare condition known as craniopagus parasiticus, which occurs when an embryo begins to split into identical twins but fails to complete the process.
Origin
Late 19th century: from cranio- + Greek 'that which is fixed'.