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 (tô′kə-măk′, tŏk′ə-)
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.]


(General Physics) 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]


(ˈtoʊ kəˌmæk, ˈtɒk ə-)

a type of experimental nuclear fusion reactor in which a plasma of ions circulates in a toroidal tube and is confined to a narrow beam by an electromagnetic field.
[1960–65; < Russian tokamák, for to(roidál'naya) kám(era s) ak(siál'nym magnítnym pólem) toroidal chamber with an axial magnetic field]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tokamak - a doughnut-shaped chamber used in fusion research; a plasma is heated and confined in a magnetic bottle
chamber - a natural or artificial enclosed space
magnetic bottle - container consisting of any configuration of magnetic fields used to contain a plasma during controlled thermonuclear reactions