tokamak

to·ka·mak Audio Help (tô'kə-māk', tŏk'ə-)

n. A doughnut-shaped chamber used in fusion research in which a plasma is heated and confined by magnetic fields.

[Russian, from to(roidal'naya) kam(era s) ak(sial'nym magnitnym polem), toroidal chamber with axial magnetic field.]

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