reactor

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re·ac·tor / rēˈaktər/ • n. 1. (also nu·cle·ar re·ac·tor) an apparatus or structure in which fissile material can be made to undergo a controlled, self-sustaining nuclear reaction with the consequent release of energy. ∎  a container or apparatus in which substances are made to react chemically, esp. one in an industrial plant.2. Med. a person who shows an immune response to a specific antigen or an adverse reaction to a drug or other substance.3. Physics a coil or other component that provides reactance in a circuit.