chimneys

noun

1. 1

   A vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon or hydrocarbon based fuels); a flue.

2. 2

   The glass flue surrounding the flame of an oil lamp.

3. 3

   The smokestack of a steam locomotive.

4. 4

   A narrow cleft in a rock face; a narrow vertical cave passage.