Dictionary![]() ![]() fast'-breed'er reac"torPronunciation: (fast'brē'dur, fäst'-), [key] Physics. a breeder reactor in which there is no moderator and fission is caused by high-energy neutrons. Also,fast' breed'er reac"tor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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