a passage or duct for smoke in a chimney.

any duct or passage for air, gas, or the like.

a tube, esp. a large one, in a fire-tube boiler.

Music .

flue pipe.

Also called windway. a narrow slit in the upper end of an organ pipe through which the air current is directed.

noun

channel , chimney , duct , exhaust pipe , passage , smoke duct , tube , vent , barb , fishnet , funnel , net , organ , pipe , stack , tunnel