|Origin:||cheminée, from Late Latin caminata, from Latin caminus 'fireplace', from Greek kaminos|
a vertical pipe that allows smoke from a fire to pass out of a building up into the air, or the part of this pipe that is above the roof:
We can't light a fire because the chimney hasn't been swept.
a tall vertical structure containing a chimney [↪ smokestack]:
a factory chimney
a narrow opening in tall rocks or cliffs that you can climb up
if someone smokes like a chimney, they smoke a lot of cigarettes or tobacco - used humorously