Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vaccīnus, a, um, adj. [vacca], of or from cows: caro, Plin. 28, 12, 50, § 185: lac, id. 25, 8, 53, § 94: caseus, id. 28, 14, 58, § 204.