Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Sosus, i, m., a proper name, Plin. 36, 25, 60, § 184.
2. Sosus, i, m., the title of a book written by Antiochus against Philo, Cic. Ac. 2, 4, 12.