Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Phĭlae, ārum, f., = αἱ Φίλαι, a small island in the Nile, south of Elephantine, with a city of the same name, now Jeziret Anas-el-Wojond, Plin. 5, 9, 10, § 59; Sen. Q. N. 4, 2, 3; Luc. 10, 313.