Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
clītellārĭus, a, um, adj. [clitellae], of or pertaining to a pack-saddle, bearing a pack-saddle: asini, Cato, R. R. 10, 1: mulus, Col. 2, 21, 3; Plaut. Most. 3, 2, 93: homines, id. ib. 3, 2, 94.