fusion reactor

Physics. a reactor for producing atomic energy by nuclear fusion. Compare reactor ( def 4 ).
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World English Dictionary
fusion reactor
a nuclear reactor in which a thermonuclear fusion reaction takes place

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

fusion reactor

a device to produce electrical power from the energy released in a nuclear fusion reaction.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The other is to spend enough time on inventing a fusion reactor so there will
  never be any pollution.
The current plan for fusion reactor design would use graphite shielding to
  absorb the stray neutrons.
We know there is a fusion reactor of some kind in there.
It's possible that it can use solar power to start up a nuclear fusion reactor
  until it gets to break even.
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