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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Likewise, the relationship between matter and energy isn't immediately useful
  unless you are building a nuclear reactor.
Tells about how atomic energy is released in a nuclear reactor.
The resulting spray shorted out electronics and forced an automatic shutdown of
  the nuclear reactor.
Even if the reactor shielding were ruptured, the alloy should keep seawater out
  of the rods for centuries.
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