a vertical structure incorporated into a building and enclosing a flue or flues for carrying off smoke; esp the part of such a structure extending above a roof

a structure through which smoke and gases, e.g. from a furnace or steam engine, are discharged

a glass tube shielding, usu of glass, placed round a flame, e.g. of an oil lamp, to serve as a shield

a narrow cleft, vent, etc, e.g. in rock