トカマクMeanings1nountokamak; toroidal magnetic plasma containment deviceA type of nuclear fusion reactor design using a toroidal magnetic field to confine plasma.from Russian国こく際さい熱ねつ核かく融ゆう合ごう実じっ験けん炉ろはトカマク型がたの核かく融ゆう合ごう炉ろです。ITER is a tokamak-type fusion reactor.