Echo, echus, f. gen. A sound rebounding to a noise or voice in a valley or woode.Penetrabilis echo. Auson. Resonabilis echo, Ouid.Reparabilis echo. Pers.
Lewis and Short: Latin dictionary
ēcho, ūs, f., = h)xw/, repercussion of sound, echo (pure Lat. imago), Plin. 36, 15, 24, 100; Pers. 1, 102; Aus. Mos. 297; id. Ep. 10, 23; 25, 68; Vulg. Sap. 17, 18.—Personified as a nymph, Ov. M. 3, 358 sq.; Aus. Epigr. 11, 7; 99, 1.