Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† porphyrĭo, ōnis, m., = πορφυρίων, a species of water-fowl, the sultana-hen, porphyrton (Fulica porphyrio, Linn.), Plin. 10, 16, 63, § 129; Vulg. Lev. 11, 18.