Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Pĕrinthus (-os), i, f., = Πέρινθος,
- I. a city of Thrace, afterwards called Heraclea, the modern Erekli, Mel. 2, 2, 6; Plin. 4, 11, 18, § 47; Liv. 33, 30.
Hence,
- II. Pĕrin-thĭus, a, um, adj., Perinthian (poet.): Menander fecit Andriam, et Perinthiam, the Perinthian, i. e. a comedy in which one of the principal characters was a girl from Perinthus, Ter. And. prol. 9.