Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕd-uncus, a, um, adj., 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.