Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mŏlendārĭus, a, um, adj. [1. molo], of or belonging to a mill or to grinding, mill- (post-class.): asina molendaria, Dig. 33, 7, 18, § 2: meta (al. molendinaria), ib. § 5.