superweapon

noun
su·​per·​weap·​on | \ ˌsü-pər-ˈwe-pən How to pronounce superweapon (audio) \
plural superweapons

Definition of superweapon

: an extremely powerful weapon President Truman had, as vice president, been kept totally in the dark about the Manhattan Project, so it was a great surprise to him to learn of the atomic superweapon soon to be at his disposal.— Kelli Peduzzi This is a trebuchet, a fearsome, poorly understood superweapon of the Middle Ages …— Evan Hadingham

First Known Use of superweapon

1914, in the meaning defined above

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The first known use of superweapon was in 1914

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