ˈtōkəˌmak, ˈtäk- noun
( -s )
Etymology: Russian, from to roidal'naya kam era s ak sial'nym magnitnym polem (toroidal chamber with an axial magnetic field)
: a toroidal device for producing controlled nuclear fusion that involves the confining and heating of a gaseous plasma by means of an internal electric current and its attendant magnetic field