a ventilator, usually mounted on the roof of a building, deck of a ship, etc., having at its head a globular, vaned rotor that is rotated by the wind, conveying air through a duct to and from a chamber below.
TURBINE VENTILATOR
Meaning of TURBINE VENTILATOR in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012