DEMISTER Meaning of DEMISTER in English /dee mis"teuhr/ , n.1. Chiefly Brit. defroster (def. 2). 2. a type of defroster for the side window of an automobile. [ 1935-40; DE- + MIST + -ER 1 ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012