Meaning of turbine ventilator

tur'bine ven"tilator

Pronunciation: [key]
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.