Hermaphroditus
noun
Her·maph·ro·di·tus (ˌ)hər-ˌma-frə-ˈdī-təs 
: a son of Hermes and Aphrodite who becomes joined in one body with a nymph while bathing
Word History
Etymology
Latin, from Greek Hermaphroditos, from Hermēs + Aphroditē Aphrodite
First Known Use
1565, in the meaning defined above