Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sollĭferreum (sōlĭf-), i, n. (sc. telum) [sollus-, i. e. totus-ferrum], a missile weapon made wholly of iron, an iron javelin, Liv. 34, 14 fin.; Gell. 10, 25, 2; cf. Fest. s. v. sollo, p. 298 Müll.; Paul. ex Fest. p. 299 ib.; and s. v. solitaurilia, p. 293 ib.