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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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
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Example sentences
Following decommissioning, the nuclear fuel was removed.
White dwarfs are stars that have burned up all of the hydrogen they once used
  as nuclear fuel.
Coal miners dug underneath the seething core to allow liquid nitrogen to be
  pumped in and cool the nuclear fuel.
But some of the time they will blast a pellet of nuclear fuel.
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