nuclear fuel

noun
1.
Physics. fissile or fertile material that undergoes fission in a nuclear reactor.
2.
any light element, as hydrogen or helium, that undergoes fusion and gives off energy within the interior of stars.

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
nuclear fuel
 
n
a fuel that provides nuclear energy, used in nuclear power stations, nuclear submarines, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Nuclear fuel is always a great word to know.
So is callithumpian. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
There have been reports that enough water remains in the reactors for cooling,
  and to prevent the nuclear fuel from being exposed.
It is utter ludicrous to claim that nuclear fuel will run out by the end of the
  century.
So despite a steep tax on nuclear fuel, they are a cheap and reliable source of
  power that emits almost no greenhouse gases.
New nuclear fuel designs have the potential to last longer and bolster safety
  margins.
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