Wiktionary
frontolysis
n. (context meteorology English) the degeneration or dissipation of an atmospheric weather front.
Wikipedia
Frontolysis
Frontolysis in meteorology, is the dissipation or weakening of an atmospheric front.
In contrary to areas of " Frontogenesis", the areas where air masses diverge are called areas of frontolysis. Siberia and Canada are examples of areas of frontolysis