Middle-earthian adjective 1noun 1forms 3 adjective1 •Of, resembling, or characteristic of, Middle-earth.And Macmillan hopes to cash in with its $29.95 Tolkien: The Illustrated Encyclopaedia, by David Day, a handsome book that leaves few Middle-earthian stones unturned. — 1991 noun1 •A native or inhabitant of Middle-earth.Middle-earthians head for Mordor to destroy object in the fires. — 1994 formsMiddle-earthians · more Middle-earthian · most Middle-earthian