Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lūror, ōris, m. [etym. dub.; cf.: pullus, lividus], a yellowish color, sallowness, paleness, Lucr. 4, 308: luror permanat in herbas, Claud. Rapt. Pros. 3, 238: lurore buxeo foedatus, App. M. 9, p. 222, 31.