Ganymedean /ˌɡænəmɪˈdiː.ən/adjective 2noun 1forms 1 adjective2 •Of or relating to the hero Ganymede in Greek mythology. •Of or relating to the Jovian moon named for Ganymede, the largest in the Solar system. noun1 •An inhabitant of Ganymede (a moon of Jupiter). formsGanymedeans