Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
perdĭtĭo, ōnis, f. [perdo], ruin, perdition (post-class.): perditionis iter, Alcim. 4, 138; Lact. 2, 14, 11; 4, 18, 32; Vulg. Matt. 7, 13 et saep.; cf. perditio, ἀπώλεια, Gloss. Philox.