Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ignĭo, īvi or ĭi, ītum, 4, v. a. [ignis], to ignite, set on fire, make red-hot (post-class.): ut igniverint, Prud. στεφ. 10, 1077.
Hence, ignītus, a, um, P. a., fiery, glowing.