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A-bomb an atomic bomb.
atom bomb see "atomic bomb."
Harry S. Truman the 33rd President of the United States (1945 to 1953), who ordered the dropping of atomic bombs for the purpose of bringing an end to World War II in Japan (b.1884--d.1972).
Hiroshima a city in southwest Honshu, Japan, on which the United States dropped an atomic bomb in August, 1945--the first use of a nuclear weapon in history. Hiroshima has been rebuilt and is a thriving city.
nuclear fission the splitting of an atomic nucleus into lighter fragments, usu. two of comparable mass, with an accompanying release of energy, as in the explosion of an atomic bomb.
test ban an agreement between nations that produce atomic bombs to refrain from nuclear testing, as in the earth's atmosphere.