Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ŏvillus, a, um, adj. [ovis], of or belonging to sheep, sheep- (class.): caseus, Cato, R. R. 76, 2: grex, Liv. 22, 10: pecus, Varr. R. R. 2, 2, 6; Col. 7, 2, 6: lac, Plin. 28, 9, 33, § 124.