Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
gŭlo, ōnis, m. [gula, II.; cf. Paul. ex Fest. s. v. ingluvies, p. 112], a gormandizer, epicure, glutton (post-class.), App. Mag. p. 295; Macr. S. 7, 12, 9.