smokestack

smoke +‎ stack

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smokestack (plural smokestacks)

1. A conduit or group of conduits atop a structure allowing smoke to flow out, as on a steam locomotive, ship, factory, or power plant using fossil fuels.
   • 1942 February, “Notes and News: An Historic American Locomotive”, in Railway Magazine, page 56:

     With its long tapered cowcatcher, massive headlamp and enormous diamond smokestack behind, wagon-top boiler, high running-plate above the driving-wheels reached from a front door in the square side-window cab, cylinders with slide valves mounted on top, and double bogie tender, General in its present form is typical of much earlier American locomotive practice.

• smokestack industry

• chimney
• flue