Lewis & Short

Tărentum, i, n. (poet. collat. form Tărentus, i, m., Sil. 12, 434; Sid. Carm. 5, 430), = Τάρας, a town of Lower Italy, founded by the Spartan Parthenians, now Taranto, Mel. 2, 4, 8; Flor. 1, 18; Cic. Sen. 4, 11 sq.; id. Brut. 18, 72; Hor. C. 3, 5, 56; id. S. 2, 4, 34; Ov. M. 15, 50 al.
Hence, Tărentīnus, a, um, adj., of or belonging to Tarentum, Tarentine: juventus, Liv. 24, 13, 2: juvenes, id. 25, 8, 3: sinus, Mel. 2, 4, 8: portus, Plin. 3, 11, 16, § 101: ager, Varr. R. R. 1, 14, 4: lanae, id. ib. 2, 2, 18; cf. oves, Col. 7, 2, 3; 7, 4, 1: castaneae, Plin. 15, 23, 25, § 93: sal, id. 31, 7, 41, § 84: purpura, Nep. ap. Plin. 9, 39, 63, § 137; cf. venenum, Hor. Ep. 2, 1, 207.
As subst.: Tărentīni, ōrum, m., the inhabitants of Tarentum, the Tarentines, Cic. Arch. 3, 5; id. Verr. 2, 4, 60, § 135; Liv. 8, 27, 2; 25, 7, 10; Just. 3, 4, 11; 20, 1, 15.