[toh-kuh-mak, tok-uh-] 
| a type of experimental nuclear fusion reactor in which a plasma of atoms circulates in a toroidal tube and is confined to a narrow beam by an electromagnetic field. |
to·ka·mak (tô'kə-māk', tŏk'ə-)  (click for larger image in new window) 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.] |