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|Noun||1.||plutonium trigger - a steel or beryllium sphere containing plutonium 239 that triggers nuclear fission when compressed by explosives|
A-bomb, atom bomb, atomic 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)
trigger - a device that activates or releases or causes something to happen
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