Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* perfrīgĕfăcĭo, ĕre, v. a. [per-frigefacto], to make very cold, to benumb: mihi perfrigefacit cor Surus, strikes a chill to my heart, makes me shudder with fear, Plaut. Ps. 4, 7, 117.