friger

From Latin frīgus (cold, frost) and frīgēre (to be cold), related to frīgidus (cold). Produces refrigerate (to make cold again), refrigerator, and refrigerant (a cooling substance). Frigidity describes extreme coldness, physical or emotional. The root is essentially confined to the concept of artificial cooling — one of the few Latin roots whose English derivatives all stay tightly within a single domain.