Noun
(astronautics) a rocket engine that uses nuclear fusion reactions for propulsive force
(astronautics) a spacecraft having a fusion reactor that powers the rocket
(astronautics) a nuclear-pulse rocket that uses thermonuclear bombs to supply propulsive force
Source: en.wiktionary.orgNuclear fusion rockets Fusion rocket starships, powered by nuclear fusion reactions, should conceivably be able to reach speeds of the order of 10% of that of light, based on energy considerations alone. Source: Internet