a weapon in which very high temperatures are used to bring about the fusion of light nuclei such as those of hydrogen isotopes (e.g., deuterium and tritium) with the accompanying release of energy, relv, milles kasutatakse väga kõrgeid temperatuure, et tekitada kergete elementide, nagu vesiniku isotoobid (nt deuteerium ja triitsium), tuumade süntees ja vabastada sellega energiat