Lewis Short
(adjective) : mordex, ĭcis, mordeo
* Biting, gnawing: asini mordices, v. l.,Plaut. Aul. 2, 3, 57 (better mordicus).—As subst.: Mor-dex, ĭcis, m., the biter, i. e. tooth, v. l. ap. App. M. 3, p. 140 (better mordicus, q. v.).
Charlton T. Lewis, Charles Short, A Latin Dictionary