Collins
World English Dictionary
fuel oil
 
n
a liquid petroleum product having a flash point above 37.8°C: used as a substitute for coal in industrial furnaces, domestic heaters, ships, and locomotives

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

fuel oil

fuel consisting mainly of residues from crude-oil distillation. It is used primarily for steam boilers in power plants, aboard ships, and in industrial plants. Commercial fuel oils usually are blended with other petroleum fractions to produce the desired viscosity and flash point. Flash point is usually higher than that of kerosene. The term fuel oil ordinarily does not include such fuels as kerosene.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
At the moment, diesel is in short supply and there is a glut of fuel oil.
By the end of the month it was offering eight super-tanker loads of fuel oil at
  below market price for cash.
Natural gas is replaces fuel oil and coal in power generation.
Some may still have the ability to switch to fuel oil if their supplies of
  natural gas or coal are curtailed somehow.
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