[toh-kuh-mak, tok-uh-]
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.

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. 2014.
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World English Dictionary
tokamak (ˈtɒkəˌmæk)
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
[C20: from Russian to(roidál'naya) kám(era s) ak(siál'nym magnitnym pólem), toroidal chamber with magnetic field]

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Example sentences
Most research in magnetic fusion energy has centered on the doughnut-shaped
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.
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