GNU Collaborative International Dictionary of English

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1.       
   nuclear reactor n. (phys.) Any of several devices that maintain and control a sustained nuclear fission chain reaction, for the production of energy, heat, or artificial elements, or for research purposes.  The main fuel sustaining the reaction and consumed by the process is typically uranium or plutonium.
   Syn. -- reactor, atomic pile, fission reactor, nuclear pile
   
   [WordNet 1.5 +PJC]