Atomic Bomb Definition

noun
An explosive weapon of great destructive power derived from the rapid release of energy in the fission of heavy atomic nuclei, especially of uranium-235 or plutonium-239.
American Heritage
An extremely destructive type of bomb, the power of which results from the immense quantity of energy suddenly released when a very rapid chain reaction of nuclear fission is set off by neutron bombardment in the atoms of a charge of plutonium (primarily Pu-239) or uranium (U-235)
Webster's New World

A nuclear weapon that obtains its destructive energy from nuclear fission.

Wiktionary
Synonyms:

Other Word Forms of Atomic Bomb

Noun

Singular:
atomic bomb
Plural:
atomic-bombs

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atomic bomb