Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
plăcor, ōris, m. [placeo], contentment, approval, satisfaction (eccl. Lat.), Vulg. Ecclus. 4, 13; 39, 23; cf.: placor, ἀρέσκεια, Gloss. Cyrill.