reactor

noun re·ac·tor \ rē-ˈak-tər \
Updated on: 21 May 2018

Definition of reactor

1 : one that reacts
2 : a device (such as a coil, winding, or conductor of small resistance) used to introduce reactance into an alternating-current circuit
3 a : a vat for an industrial chemical reaction
b : a device for the controlled release of nuclear energy (as for producing heat)

Recent Examples of reactor from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'reactor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of reactor

1890

in the meaning defined at sense 1

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REACTOR Defined for English Language Learners

reactor

Definition of reactor for English Language Learners

  • physics : a large device that produces nuclear energy


REACTOR Defined for Kids

reactor

noun re·ac·tor \ rē-ˈak-tər \

Definition of reactor for Students

: a device using atomic energy to produce heat

Medical Dictionary

reactor

noun re·ac·tor \ rē-ˈak-tər \

medical Definition of reactor

1 : one that reacts: as
a : a chemical reagent
b : an individual reacting to a stimulus
c : an individual reacting positively to a foreign substance (as in a test for disease)
  • reactors to tuberculin
2 a : a piece of equipment in which a chemical reaction and especially an industrial chemical reaction is carried out
b : a device for the controlled release of nuclear energy (as for producing heat)


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