Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Memmius, a, name of a Roman gens. mox Italus Mnestheus, genus, a quo nomine Memmi, Verg. A. 5, 117. So C. Memmius, a public man, who, being adjudged guilty of ambitus, went into exile to Athens, to him Cicero addressed several letters, and to him Lucretius dedicated his poem, De Rerum Natura; cf. Lucr. 1, 42.
Hence,