re·ac·tor

[ree-ak-ter]
noun
1.
a person or thing that reacts or undergoes reaction.
2.
Electricity. a device whose primary purpose is to introduce reactance into a circuit.
3.
Immunology, Veterinary Medicine. a patient or animal that reacts positively towards a foreign material.
4.
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.
5.
Chemistry. (especially in industry) a large container, as a vat, for processes in which the substances involved undergo a chemical reaction.

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

non·re·ac·tor, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To reactor
00:10
Reactor is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
Collins
World English Dictionary
reactor (rɪˈæktə) [Click for IPA pronunciation guide]
 
n
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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Etymonline
Word Origin & History

reactor
"one that reacts," 1890 (see reaction). In nuclear sense, attested from 1945.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Regulators approve nuclear reactor design they say is safe.
But building a fusion reactor that can convert that tremendous heat into useful
  energy has posed an immense challenge.
Winds can pick up radioactive material accidentally released from a nuclear
  reactor and scatter it around the world.
If you ram gases through a reactor, you're limit then becomes the amount of
  material you can turn into gas.
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