reactor

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

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
3a : 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

Even after the infamous meltdown in 1986, the other nuclear reactors at the facility continued operating until the turn of the century. Avery Thompson, Popular Mechanics, "Chernobyl Has a New Power Plant, But This Time It's Solar," 9 Oct. 2018 The three reactors at the Tomari plant had switched to emergency backup generators to keep spent fuel safely cooled. Fox News, "The Latest: 9 dead, 30 missing in northern Japan quake," 6 Sep. 2018 Five have retired in the past five years, and 12 reactors at nine plants have announced plans to retire ahead of schedule. David Roberts, Vox, "Half of America’s carbon-free electricity comes from nuclear. Here’s how to save it.," 10 May 2018 The Pentagon tested prototype engines with 500-megawatt reactors at the Department of Energy Nevada Test Site in 1961 and 1964, but soon after had second thoughts about the project. Larry Greenemeier, Scientific American, "Russia’s New Nukes Are Similar to a Risky Project the U.S. Abandoned," 2 Mar. 2018 The Bulletin of Atomic Scientists says a hassle-free, low-maintenance reactor is unlikely at this point of technological development. Kyle Mizokami, Popular Mechanics, "Critics Roast the Department of Defense’s Battlefield Nuclear Reactor," 25 Feb. 2019 This is what happens when someone tries to build a nuclear reactor in the United States today. Avery Thompson, Popular Mechanics, "The Alexandria Ocasio-Cortez 'Green New Deal' Wants to Get Rid of Nuclear Power. That's a Great Idea.," 8 Feb. 2019 North Korea bombed a cooling tower servicing a nuclear reactor at a different nuclear research site, in Yongbyon. Salvador Rizzo, Washington Post, "President Trump’s exaggerated claims about the North Korea deal," 2 July 2018 Myth: There's a nuclear reactor at the University of Arizona Reality: This one is true. Rachel Leingang, azcentral, "Rooftop pools? Haunted buildings? 8 Arizona university myths debunked, confirmed," 20 June 2018

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.

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First Known Use of reactor

1890, in the meaning defined at sense 1

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Last Updated

26 Mar 2019

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Time Traveler for reactor

The first known use of reactor was in 1890

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More Definitions for reactor

reactor

noun

English Language Learners Definition of reactor

physics : a large device that produces nuclear energy

reactor

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

Kids Definition of reactor

: a device using atomic energy to produce heat

reactor

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

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
2a : 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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More from Merriam-Webster on reactor

Rhyming Dictionary: Words that rhyme with reactor

Spanish Central: Translation of reactor

Nglish: Translation of reactor for Spanish Speakers

Britannica English: Translation of reactor for Arabic Speakers

Britannica.com: Encyclopedia article about reactor

Comments on reactor

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