General term for combustible material used to produce heat or power, including gasoline, coal, firewood, and metaphorical uses.
The car is almost out of fuel.
The fuel for this stove is kerosene.
I filled the car with fuel before setting off.
We ran out of fuel in the mountains.
The plane refueled midway through the flight.
This engine consumes a large amount of fuel.
fuel rod
fuel oil