木卫三 Traditional form: 木衛三 Pinyin (reading): Mùwèi Sān Definitions: Ganymede (moon of Jupiter), aka Jupiter III Characters: 木 - tree; wood, lumber; wooden 卫 - to guard, to protect, to defend 三 - three Traditional characters: 木 - tree; wood, lumber; wooden 衛 - to guard, to protect, to defend 三 - three