|Origin:||fouaille, from feu 'fire', from Latin focus; FOCUS1|
fu‧el1 S2 W2
[uncountable and countable]
a substance such as coal, gas, or oil that can be burned to produce heat or energy:
The plane was running low on fuel.
Coal is one of the cheapest fuels.
the car's fuel consumption (=how much fuel it uses to travel a particular distance)
an empty fuel tank