Oil which is used as fuel either in an internal-combustion engine or in a furnace.(noun)
The Century Dictionary (Public Domain)
Use "fuel-oil" in a sentence
"The winter that we took office was extremely cold, with fuel-oil shortages in the Northeast, but Carter was looking beyond the present moment and conceiving long-term strategies."
"The captain of a container ship wedged on a reef off New Zealand has appeared in court over its grounding as more thick fuel-oil fouls beaches in the country's worst environmental disaster in decades."
"In July 2007, Tepco, as Tokyo Electric Power, is known, sharply increased its fuel-oil and LNG imports after closing seven reactors at its Kashiwazaki-Kariwa plant in northwest Japan following an earthquake."