Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
messōrĭus, a, um, adj. [messor], of or belonging to a reaper (class.): messoria corbis, a reaper’s basket, Cic. Sest. 38, 82: falces, Pall. 1, 43: opera, Col. 2, 13, 2.