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[toh-kuh-mak, tok-uh-] /ˈtoʊ kəˌmæk, ˈtɒk ə-/
noun, Physics.
a type of experimental nuclear fusion reactor in which a plasma of atoms circulates in a toroidal tube and is confined to a narrow beam by an electromagnetic field.
Origin of tokamak
1960-65; < Russian tokamák, acronym from toroidálʾnaya kámera s aksiálʾnym magnítnym pólem toroidal chamber with an axial magnetic field Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for tokamak
  • Most research in magnetic fusion energy has centered on the doughnut-shaped tokamak.
  • Prior to the lithium fill, tokamak discharges were run for several months, using the empty stainless steel tray as a limiter.
  • Study activities have focused on the technical evaluation of a compact, high field, highly shaped tokamak.
  • Soviet scientists had recently managed to confine fusion's elusive plasma in a device called a tokamak.
  • Because helium particles can radiate away the energy of fusion, the plasma could cool down, degrading tokamak performance.
  • But only if there exists a faster route of development than that now envisaged for the tokamak.
  • The torus experiment's goal is to investigate the characteristics and effectiveness of the spherical tokamak configuration.
British Dictionary definitions for tokamak


(physics) a toroidal reactor used in thermonuclear experiments, in which a strong helical magnetic field keeps the plasma from contacting the external walls. The magnetic field is produced partly by current-carrying coils and partly by a large inductively driven current through the plasma
Word Origin
C20: from Russian to(roidál'naya) kám(era s) ak(siál'nym magnitnym pólem), toroidal chamber with magnetic field
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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