Gan·y·mede 
(gănə-mēd′)
(gănə-mēd′)n.
1. Greek Mythology A Trojan boy of great beauty whom Zeus carried away to be his lover and to be cupbearer to the gods.
2. One of the four brightest satellites of Jupiter. Originally sighted by Galileo, it is the largest satellite in the solar system.
[Latin Ganymēdēs, from Greek Ganumēdēs.]