| NOUN | artifact | fast reactor | nuclear reactor in which nuclear fissions are caused by fast neutrons because little or no moderator is used |
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| Meaning | nuclear reactor in which nuclear fissions are caused by fast neutrons because little or no moderator is used. | |
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| Broader | nuclear reactor, reactor | (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements |
| Opposite | thermal reactor | A nuclear reactor in which nuclear fissions are caused by neutrons that are slowed down by a moderator |
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