an oil used for fuel, especially one used as a substitute for coal, as crude petroleum.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use fuel oil in a sentence
Venezuela recently sent its third shipment of fuel oil to Syria.Despite Massacre, Chávez Fueling Friendship With Syria | Mac Margolis | June 6, 2012 | THE DAILY BEAST
We request everybody outside of the disaster area to refrain from hoarding gasoline, light diesel, and heavy fuel oil.
fuel oil, gasoline, lubricating oil—for these three essentials are there no practical substitutes or other adequate sources?Conservation Through Engineering | Franklin K. Lane
fuel oil can be largely supplanted by coal, but for the internal-combustion engine there is no quantitative substitute.Conservation Through Engineering | Franklin K. Lane
A fuel-oil truck disappeared from the street outside of Dabney Brothers' and was found abandoned in the morning.And Then the Town Took Off | Richard Wilson
fuel oil for the engines, and even lubricating oil, could be sent from the tender to the submarine in a very simple manner.The Submarine in War and Peace | Simon Lake
Another feature is harmonizing the fuel oil and the lubricating oil so that one will not counteract the effects of the other.Farm Mechanics | Herbert A. Shearer
British Dictionary definitions for fuel oil
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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012