Eridian /ɛˈrɪdiən/adjective 3noun 3forms 3 adjective3 •Of or pertaining to the Greek goddess Eris. •Of or pertaining to the dwarf planet named for Eris.Dysnomia […] is the Eridian moon. •Of or pertaining to the constellation of Eridanus, or any Eridani object noun3 •a theoretical inhabitant of the dwarf planet Eris •a theoretical inhabitant of an Eridani system •a theoretical denizen of the constellation Eridanus formsEridians · more Eridian · most Eridian