flue
(a pipe or channel that takes smoke, gas, etc. out of a building)
- We need to install a metal flue for furnace.
- The smoke won’t go out, because the flue is blocked up.
flue (formal influenza)
(an illness like a very bad cold that causes fever, pains and weakness)
- I think I have got (the) flu.
- she was in bed with flu for a week.