tokamak
noun
to·ka·mak ˈtō-kə-ˌmak 
ˈtä-
ˈtä- variants or less commonly tokomak
: 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
Example Sentences
Recent Examples on the Web The world’s largest tokamak fusion reactor in the works, ITER in France, will weigh 23,000 tons. 
Caroline Delbert, Popular Mechanics, 12 July 2022 So in a tokamak reactor, plasma is heated more and more until its charged ions start to merge. Caroline Delbert, Popular Mechanics, 18 Feb. 2022 This pumps out the diverted particles and removes any excess heat to protect the tokamak. David Donovan, The Conversation, 4 Apr. 2022 So what goes wrong with magnets in a typical tokamak run? Caroline Delbert, Popular Mechanics, 18 Feb. 2022 The inner vessel wall of the tokamak was upgraded from graphite to beryllium. David Donovan, The Conversation, 4 Apr. 2022 Tokamak Energy, an amusingly hard-to-Google company based in Oxford in the south of England, has been working on tokamak reactors since 2009. Caroline Delbert, Popular Mechanics, 1 Apr. 2022 The tokamak comes courtesy of the Swiss Plasma Center at the EPFL in Lausanne. John Timmer, Ars Technica, 16 Feb. 2022 Developing the control software for a tokamak is a complicated process. John Timmer, Ars Technica, 16 Feb. 2022 See More
Caroline Delbert, Popular Mechanics, 12 July 2022 So in a tokamak reactor, plasma is heated more and more until its charged ions start to merge. Caroline Delbert, Popular Mechanics, 18 Feb. 2022 This pumps out the diverted particles and removes any excess heat to protect the tokamak. David Donovan, The Conversation, 4 Apr. 2022 So what goes wrong with magnets in a typical tokamak run? Caroline Delbert, Popular Mechanics, 18 Feb. 2022 The inner vessel wall of the tokamak was upgraded from graphite to beryllium. David Donovan, The Conversation, 4 Apr. 2022 Tokamak Energy, an amusingly hard-to-Google company based in Oxford in the south of England, has been working on tokamak reactors since 2009. Caroline Delbert, Popular Mechanics, 1 Apr. 2022 The tokamak comes courtesy of the Swiss Plasma Center at the EPFL in Lausanne. John Timmer, Ars Technica, 16 Feb. 2022 Developing the control software for a tokamak is a complicated process. John Timmer, Ars Technica, 16 Feb. 2022 See More Word History
Etymology
Russian, from toroidal'naya kamera s aksial'nym magnitnym polem (toroidal chamber with an axial magnetic field)
First Known Use
1965, in the meaning defined above