Definitions for nuclear propulsion
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Princeton's WordNet
nuclear propulsion(noun)
the use of a nuclear reactor either to produce electricity to power an engine (as in a nuclear submarine) or to directly heat a propellant (as in nuclear rockets)
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"nuclear propulsion." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/nuclear propulsion>.