Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
hernĭōsus, a, um, adj. [hernia], ruptured, having a rupture: patruus, Verg. Cat. 5, 39.
Plur. subst.: hernĭōsi, ōrum, m., ruptured persons, Lampr. Heliog. 25, 6.