demister

noun

1. The part of the ventilation system in a motor car that blows hot, dry air against the inside of the windscreen to prevent or remove condensation.

   “These screens incorporate a layer of transparent gold film in the laminations which forms an electric heating element to act as de-icer and de-mister.”

   “The drivers' cabs are fitted with the latest equipment, including a loudaphone, electric demisters and two-tone horns; provision is made for the fitting of A.W.S. equipment when available.”

2. Any of various devices that remove droplets of water from air.