Lewis & Short

Pĕrinthus (-os), i, f., = Πέρινθος,

  1. I. a city of Thrace, afterwards called Heraclea, the modern Erekli, Mel. 2, 2, 6; Plin. 4, 11, 18, § 47; Liv. 33, 30.
    Hence,
  2. 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.