'dicephalic' originates from New Latin and Greek, specifically the New Latin word 'dicephalus', where the prefix 'di-' meant 'two' and Greek 'kephalē' meant 'head'.

'dicephalic' changed from New Latin 'dicephalus', which itself comes from Greek 'dikephalós' (di- + kephalē), and eventually became the modern English adjective 'dicephalic'.

Initially, it meant 'having two heads' in classical and medical usage, and over time it has retained that specialized meaning in modern English.