galaxyEnglishOxford American Thesaurusgalaxy noun 1 he focused his telescope on the galaxy: star system, solar system, constellation, cluster, nebula; spiral galaxy, Seyfert galaxy; stars, heavens. 2 a galaxy of the rock world's biggest stars: brilliant gathering, dazzling assemblage, illustrious group; host, multitude, array, mass, bevy, horde, company, army, flock, group.