Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
fātĭfer, ĕra, ĕrum, adj. [fatum-fero], that brings death, death-dealing, deadly, destructive (poet.): sonat unā fatifer arcus, Verg. A. 9, 631: ensis, id. ib. 8, 621; Ov. M. 12, 492: ferrum, id. ib. 6, 251: Mavors, id. Am. 3, 3, 27.