n.
Variant: also to · ko · mak
Pronunciation: ' t ō -k ə - ˌ mak, ' tä-
Function: noun
Etymology: Russian, from to roidal'naya kam era s ak sial'nym magnitnym polem (toroidal chamber with an axial magnetic field)
Date: 1965
: a toroidal device for producing controlled nuclear fusion that involves the confining and heating of a gaseous plasma by means of an electric current and magnetic field