tokamak

noun
to·​ka·​mak | \ ˈtō-kə-ˌmak How to pronounce tokamak (audio) , ˈtä- How to pronounce tokamak (audio) \
variants: or less commonly tokomak

Definition of tokamak

: a toroidal device for producing controlled nuclear fusion that involves the confining and heating of a gaseous plasma by means of an electric current and magnetic field

Examples of tokamak in a Sentence

Recent Examples on the Web This superpowered tokamak device and the related stellarator device form the bulk of fusion technology research. Caroline Delbert, Popular Mechanics, "China Is Building an Artificial Sun," 20 Dec. 2019 All tokamaks, including spherical ones, suffer from a limitation, however. Adrian Cho, Science | AAAS, "After decades of decline, the U.S. national fusion lab seeks a rebirth," 6 Feb. 2020 Researchers at Princeton University have found a way to make a tokamak nuclear fusion reactor safer using insulating boron powder. Caroline Delbert, Popular Mechanics, "This Powder—Not Gas—Could Rescue Nuclear Fusion," 26 Dec. 2019 The joint European torus (JET), a tokamak hosted in the United Kingdom that produced its first plasma in 1983 and is the most powerful fusion facility in use, is also providing an important testbed for materials and technologies for ITER. Giulia Pacchioni, Scientific American, "The Road to Fusion," 26 Aug. 2019 The stellarator, however, traps the plasma in a twisting and spiraling shape, rather than the torus (doughnut shape) of a tokamak. Jay Bennett, Popular Mechanics, "German Nuclear Fusion Experiment Sets Records for Stellarator Reactor," 26 June 2018 Assembly [of the tokamak] will be quite challenging and hard to stay on schedule. Daniel Clery, Science | AAAS, "Knighthood in hand, astrophysicist prepares to lead U.S. fusion lab," 19 June 2018 The device, a magnetic-confinement fusion reactor named for the sun, was shoved to the side after Soviet scientists revealed their tokamak design to the world in 1968. Jay Bennett, Popular Mechanics, "German Nuclear Fusion Experiment Sets Records for Stellarator Reactor," 26 June 2018 Spherical tokamaks do this by seeking to hold the plasma in the center of the device, close to the central column. Daniel Clery, Science | AAAS, "Knighthood in hand, astrophysicist prepares to lead U.S. fusion lab," 19 June 2018

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

See More

First Known Use of tokamak

1965, in the meaning defined above

History and Etymology for tokamak

Russian, from toroidal'naya kamera s aksial'nym magnitnym polem (toroidal chamber with an axial magnetic field)

Keep scrolling for more

Learn More about tokamak

Time Traveler for tokamak

Time Traveler

The first known use of tokamak was in 1965

See more words from the same year

Statistics for tokamak

Cite this Entry

“Tokamak.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tokamak. Accessed 7 Jul. 2020.

More from Merriam-Webster on tokamak

Rhyming Dictionary: Words that rhyme with tokamak

Britannica.com: Encyclopedia article about tokamak

Comments on tokamak

What made you want to look up tokamak? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!