Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-frīgĭdo, āvi, ātum, 1, v. a., to make cold or cool, to cool (late Lat.): caput, Cael. Aur. Tard. 1, 1 med.: infrigidatus fuit, Vet. Schol. ad Juv. 7, 149.