Lewis Short
(adjective) : rĕd-uncus, a, um
* Curved or bent backwards (very rare; syn.: recurvus, repandus): jamque aliis adunca, aliis redunca (cornua dedit),Plin. 11, 37, 45, § 125.— Poet., in gen., curved, bent: pennis rostroque redunco,Ov. M. 12, 562: ora redunca,id. ib. 11, 342.
Charlton T. Lewis, Charles Short, A Latin Dictionary