Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Vĕnāfrum, i, n., a very ancient town of the Samnites, celebrated for its olive-oil, now Venafro, Plin. 3, 5, 9, § 63; Cato, R. R. 135; 136; Cic. Att. 7, 13, b, 7; id. Q. Fr. 3, 1, 2, § 3; Hor. C. 2, 6, 16; Mart. 13, 101, 1.
Hence,