| NOUN | artifact | plutonium trigger, plutonium pit | a steel or beryllium sphere containing plutonium 239 that triggers nuclear fission when compressed by explosives |
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| Meaning | A steel or beryllium sphere containing plutonium 239 that triggers nuclear fission when compressed by explosives. | |
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| Synonym | plutonium pit | |
| Part of | atom bomb, atomic bomb, A-bomb, fission bomb, plutonium bomb | A nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239) |
| Broader | trigger | A device that activates or releases or causes something to happen |
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