fusion reactor(n = noun.artifact) thermonuclear reactor - a nuclear reactor that uses controlled nuclear fusion to generate energy;
is a kind of nuclear reactor, reactor

atomic reactor, boiling water reactor, breeder reactor, chain reactor, chemical reactor, cold fusion, fast reactor, fusion, fusion bomb, fusion cooking, gas-cooled reactor, heat of fusion, liquid metal reactor, nuclear fusion, nuclear fusion reaction, nuclear reactor, optical fusion, power reactor, pressurized water reactor, reactor, spinal fusion, thermal reactor, thermonuclear reactor, water-cooled reactor