Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. cancellārĭus, ii, m. [cancelli; Engl. chancellor] (late Lat.).
2. cancellārĭus, a, um, adj. [cancelli], living or kept behind bars: turdus, Schol. Pers. 6, 24.