Lewis Short
(adjective) = ἔχιδνα: ĕchidna, ae, f.
* An adder, viper. The Furies were said to have them twined in their hair; hence: stipite te Stygio tumidisque adflavit Echidnis E tribus una soror,Ov. M. 10, 313.
* Nom. prop.
* Lernaea, the Lernaean hydra, killed by Hercules, Ov. M. 9, 69; 158; id. F. 5, 405.
* A monster, half woman and half serpent, the mother of Cerberus, Ov. M. 4, 501.—Hence, Echidnēus, a, um, , of Echidna: canis,i. e. Cerberus,Ov. M. 7, 408.
Charlton T. Lewis, Charles Short, A Latin Dictionary