reactor

noun

re·​ac·​tor rē-ˈak-tər How to pronounce reactor (audio)
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)

Examples of reactor in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Microsoft and Constellation plan to restart Three Mile Island in Pennsylvania; Amazon took a stake in advanced reactor company X-energy; Google linked up with Kairos Power. Daniel Moore, Axios, 4 Nov. 2024 Small modular reactors promise to reduce capital costs and speed the deployment of nuclear plants. Spencer Kimball, CNBC, 1 Nov. 2024 Currently, there are only three operational SMRs in the world, with two in China and Russia, while the third, a test reactor, is in Japan. Ariel Cohen, Forbes, 1 Nov. 2024 What Happened to the Reactor The reactor is one of the three at the Onagawa plant, north of the Fukushima Daiichi plant where three reactors melted following a magnitude 9.0 earthquake and tsunami in March 2011, releasing large amounts of radiation. Nina Turner, Newsweek, 29 Oct. 2024 See all Example Sentences for reactor 

Word History

First Known Use

1890, in the meaning defined at sense 1

Time Traveler
The first known use of reactor was in 1890

Dictionary Entries Near reactor

Cite this Entry

“Reactor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/reactor. Accessed 28 Nov. 2024.

Kids Definition

reactor

noun
re·​ac·​tor rē-ˈak-tər How to pronounce reactor (audio)
1
: one that reacts
2
: a device for the controlled release of nuclear energy (as for producing heat)

Medical Definition

reactor

noun
re·​ac·​tor rē-ˈak-tər How to pronounce reactor (audio)
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)

More from Merriam-Webster on reactor

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