Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ansĕrīnus, a, um, adj. [anser], of or pertaining to geese: genus, Col. 8, 5, 10; Plin. 10, 22, 29, § 56: pedes, id. 11, 47, 107, § 257: adeps, goose-grease, id. 30, 8, 22, § 133 al.: lana, down, Dig. 32, 68.