Main Entry:

to·ka·mak

Variant(s):

also to·ko·mak \ˈtō-kə-ˌmak, ˈtä-\

Function:

noun

Etymology:

Russian, from toroidal'naya kamera s aksial'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