noun
heavy oil; fuel oil
Refers to heavy petroleum fractions used as industrial fuel, such as in boilers and ships. Not used for light oils like gasoline or kerosene.
この工場ではボイラーの燃料に重油を使っている。
This factory uses heavy oil as fuel for its boilers.
重油の価格が上がると、発電コストも上がる。
When the price of fuel oil rises, the cost of power generation also increases.
Compound of 重 (heavy) and 油 (oil), directly describing its physical property as a heavy petroleum product.