Lewis & Short

Tricca, ae, and Triccē, ēs, f., = Τρίκκη, a town of Thessaly, on the Peneus, now Trikala, Plin. 4, 8, 15, § 29; Liv. 32, 13, 5; Sen. Troad. 824.
Hence, Triccaeus, a, um, adj., of Tricca, Avien. Arat. 206.