Lewis & Short

Gordĭum, ii, n., = Γόρδιον, a city of Phrygia Major on the Sangarius, famous for the Gordian knot (v. Gordius), Plin. 5, 32, 42, § 146; Liv. 38, 18, 10 sqq.; Curt. 3, 1, 12 sqq.
Hence, Gordĭensis, e, adj., of Gordium, Scrib. 172.