Definition of atomic bomb
1
: a bomb whose violent explosive power is due to the sudden release of energy resulting from the splitting of nuclei of a heavy chemical element (such as plutonium or uranium) by neutrons in a very rapid chain reaction
— called also atom bomb
2
: a nuclear weapon (such as a hydrogen bomb)
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Merriam-Webster unabridged
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Time Traveler for atomic bomb
The first known use of atomic bomb was in 1914
See more words from the same year