Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vĭror, ōris, m. [vireo], green color, greenness, verdure (post-class. for viriditas): pratorum, App. Flor. p. 348, 18: superest aliquid de virore, Pall. Jun. 12; Vop. Prob. 19.