Search Result for "nuclear propulsion":
Wordnet 3.0

NOUN (1)

1. 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); 



WordNet (r) 3.0 (2006):

nuclear propulsion
    n 1: 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)