Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Īrus, i, m., = Ἶρος, the name of a beggar in the house of Ulysses at Ithaca; used proverbially to denote a poor man: Irus est subito, qui modo Croesus erat, Ov. Tr. 3, 7, 42: Iron, id. R. Am. 747; Prop. 3, 3, 39 (4, 4, 17): Iro pauperior, Mart. 5, 41, 9; id. 5, 39, 9; 6, 77, 1.
In Ov. Ib. 415, binominis, double-named, because he was named Arnaeus by his mother.