Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Memphis, is and ĭdos, f., = Μεμφις, a city of Middle Egypt, celebrated as the residence of the Egyptian kings, now Metrahenny (fourteen miles south of Cairo), Mel. 1, 9, 9; Plin. 2, 85, 87, § 201; 5, 9, 9, § 50; Liv. 45, 11 sq.; Hor. C. 3, 26, 10; Tac. H. 4, 84; Prop. 3, 11, 34: quae colis, et Memphin, palmiferamque Pharon, Ov. Am. 2, 13, 7.
Hence,