reactor

noun

re·​ac·​tor rē-ˈak-tər 

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

The state has ample uranium ore reserves, including the type that many advanced reactors need. —Katie Fehrenbacher, Axios, 13 Aug. 2024

While these extensions are critical to keeping existing reactors operational, the average age of U.S. commercial nuclear power reactors is 42 years. —Heather Reams, Baltimore Sun, 12 Aug. 2024

The acting governor of Kursk region, Alexei Smirnov, said drone debris had fallen on a power substation near Kurchatov, site of one of Russia’s largest nuclear power stations with four reactors. —Reuters, NBC News, 10 Aug. 2024

Getting to net-zero emissions will also require investment in advanced nuclear technologies—for example, reactors that can recycle spent nuclear fuel, leaving less waste, and in small modular reactors. —Rafael Mariano Grossi, Foreign Affairs, 18 July 2024

Word History

First Known Use

1890, in the meaning defined at sense 1

Phrases Containing reactor

• atomic reactor
• hyper-reactor
• nuclear reactor

Kids Definition

reactor

noun

re·​ac·​tor rē-ˈak-tər 

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 

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)