chim ‧ ney /ˈtʃɪmni/ BrE AmE noun [countable]
[ Date: 1200-1300 ; Language: Old French ; Origin: cheminée , from Late Latin caminata , from Latin caminus 'fireplace' , from Greek kaminos ]
1 . 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.
2 . a tall vertical structure containing a chimney ⇨ smokestack :
a factory chimney
3 . technical a narrow opening in tall rocks or cliffs that you can climb up
4 . smoke like a chimney if someone smokes like a chimney, they smoke a lot of cigarettes or tobacco – used humorously