Lewis Short
Hydrūs | Hydruntum, i (noun F.n) : Ὑδροῦς
* A city of Calabria, under a mountain of the same name, now Otranto, Plin. 3, 11, 16, § 101; Cic. Fam. 16, 9, 2; id. Att. 15, 21, 3; 16, 5, 3; Mel. 2, 4, 7.—In masc., avius Hydrus, of the city and mountain, Luc. 5, 375.—The city is also called , , , Liv. 36, 21, 5; Plin. 3, 11, 16, § 100.
Charlton T. Lewis, Charles Short, A Latin Dictionary