de·fog 
/diˈfɑ:g/ verb
de·fogs; de·fogged; de·fog·ging /diˈfɑ:g/ verb [+ obj] US : to remove mist from (a window, mirror, etc.) by using dry heat
▪ defog [=(Brit) demist] the windshield — compare defrost, deice
▪ defog [=(Brit) demist] the windshield — compare defrost, deice
— de·fog·ger noun, plural de·fog·gers [count]
▪ a window defogger
▪ a window defogger
