a person or thing that reacts or undergoes reaction.
Electricity. a device whose primary purpose is to introduce reactance into a circuit.
Immunology, Veterinary Medicine. a patient or animal that reacts positively towards a foreign material.
Also called atomic pile, chain reactor, chain-reacting pile, nuclear reactor, pile. Physics. an apparatus in which a nuclear-fission chain reaction can be initiated, sustained, and controlled, for generating heat or producing useful radiation.
Chemistry. (especially in industry) a large container, as a vat, for processes in which the substances involved undergo a chemical reaction.

1885–90; 1940–45 for def 4; react + -or2

nonreactor, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reactor (rɪˈæktə)
1.  chem a substance, such as a reagent, that undergoes a reaction
2.  short for nuclear reactor
3.  a vessel, esp one in industrial use, in which a chemical reaction takes place
4.  a coil of low resistance and high inductance that introduces reactance into a circuit
5.  med a person sensitive to a particular drug or agent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"one that reacts," 1890 (see reaction). In nuclear sense, attested from 1945.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for reactors
The reactors are used in nuclear power plants to produce nuclear power from
  nuclear fuel.
In some reactors, the coolant also acts as a neutron moderator.
Light water reactors use ordinary water to moderate and cool the reactors.
Production reactors for transmutation of elements breeder reactors.
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