Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prae-frīgĭdus, a, um, adj., very cold: praefrigidus Auster, Ov. P. 4, 12, 35: aqua vel tepida vel praefrigida, Cels. 2, 30: unda, Just. 11, 8, 4: situs, Plin. 17, 20, 34, § 147.