Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
fertum (ferct-), i, n. [fertor], a sort of oblation-cake, Fab. Pict. ap. Gell. 10, 15, 14; Cato, R. R. 134, 2; 141, 4; Pers. 2, 48.