Terran /ˈtɛ.ɹən/adjective 1noun 1forms 3 adjective1 •Of Earth; of terrestrial origin. noun1 •An inhabitant of Earth; an earthling, especially a human.The magazines, in the nearby rack, were in English. And on their covers, laughing Terrans. — 1966 formsTerrans · more terran · most terran