Polycephaly is a condition of having more than one head. The term is derived from the Greek stems poly- meaning ‘much’ and kephali- meaning “head”, and encompasses bicephaly and dicephaly (both referring to two-headedness). A variation is an animal born with two faces on a single head, a condition known as diprosopus. In medical terms these are all congenital cephalic disorders. There are many occurrences of multi-headed animals, in real life as well as in mythology.
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