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reactor (n.)

"one that reacts," 1835, agent noun in Latin form from react. By 1915 in electricity as "coil or other piece of equipment which provides reactance in a circuit;" the nuclear sense is attested from 1945.

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Definitions of reactor from WordNet

reactor (n.)
an electrical device used to introduce reactance into a circuit;
reactor (n.)
(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements;
Synonyms: nuclear reactor
From wordnet.princeton.edu