Search Result for "fast reactor":
Wordnet 3.0

NOUN (1)

1. nuclear reactor in which nuclear fissions are caused by fast neutrons because little or no moderator is used; 



WordNet (r) 3.0 (2006):

fast reactor
    n 1: nuclear reactor in which nuclear fissions are caused by
         fast neutrons because little or no moderator is used [ant:
         thermal reactor]